Hi everyone! ’m having a bit of trouble figuring out how to transfer my books.
I tried connecting my Kindle to my MacBook via USB and opening Calibre, but nothing happened, simply didn’t recognize the device at all.
I’m wondering what the convenient way to connect the Kindle Colorsoft to a Mac is. Is it better to use the official Amazon Send-to-Kindle App with its built-in USB File Manager, or should I look into third-party file transfer tools?
Your Mac and Calibre aren’t recognizing the Kindle because Amazon changed how newer Kindles connect over USB. You’re not doing anything wrong.
Starting with the 12th-generation models, including the Kindle Colorsoft, 12th Gen Paperwhite, 2024 Basic, and Scribe, Amazon replaced standard USB Mass Storage with MTP, or Media Transfer Protocol. Windows supports MTP natively, but macOS doesn’t. Because of that, the Kindle won’t appear as a normal external drive on your MacBook.
The simplest option is Amazon’s official Send-to-Kindle app:
If you’d rather manage everything locally without Amazon’s software, an MTP file-transfer app can handle the connection instead.
I haven’t tested every Mac and Kindle combination, but users in this Reddit Calibre & Kindle Colorsoft discussion specifically mention MacDroid and OpenMTP as possible solutions.
For example, MacDroid works as an MTP bridge and file manager. Once the Kindle is connected over USB, it can expose the device’s internal storage in Finder. From there, you can browse folders and copy, move, or edit files much like you would with a flash drive.
Copying the file successfully doesn’t mean the Colorsoft can read it. An EPUB dragged over with MacDroid may transfer fine but still won’t appear as a book because USB sideloading doesn’t convert it. If you want to avoid Calibre, use Send to Kindle for EPUB conversion. MacDroid makes more sense for PDFs or files already in a Kindle-compatible format, copied into the Documents folder.
Don’t leave Calibre or Amazon’s USB File Manager open while trying MacDroid, since another app may already have control of the MTP connection. Quit them, reconnect the Colorsoft with a data-capable cable, wake it, then open MacDroid and copy supported files into Documents. For EPUBs, skip USB and use Send to Kindle so Amazon converts them first.
You probably won’t get the old “plug it in and drag books from Finder” experience on a Colorsoft. Even when an MTP app makes the storage visible, it is still an extra layer between Finder and the Kindle, so it is less convenient than older models.
The better route depends on what you mean by reliable. For EPUB files, Send to Kindle is usually the cleaner option because Amazon converts them and adds them to your personal document library. Those books can then download over Wi-Fi, and reading position, notes, and highlights can sync across compatible Kindle apps and devices. The downside is that the file goes through Amazon’s servers and remains in your library until you delete it.
USB through MacDroid or OpenMTP is more private and works without waiting for a cloud upload, but it behaves like traditional sideloading. There is no automatic EPUB conversion, no cloud backup, and generally no cross-device synchronization. It is best suited to PDFs and files that are already in a format the Kindle can open. As @its_gadget said, successfully copying an EPUB only proves that the transfer worked, not that the Kindle can use the file.
There is a useful middle ground if you still want local USB transfer: prepare the book in a Kindle-compatible format first, close Calibre and Amazon’s file manager, then connect through a single MTP app and copy it into the Documents folder. Don’t run two transfer tools at once, because MTP devices typically allow only one program to control the connection. If the Kindle never appears, test another cable before changing software. Plenty of USB-C cables charge correctly but carry no data.
So I would use Send to Kindle for EPUB novels and anything you want synced, and reserve MTP transfer for PDFs, large local documents, or situations where you do not want the file uploaded. That split is less frustrating than trying to force every file through one method.
Set your expectation that USB may remain awkward even after you install the “right” program. Before changing apps again, check Apple menu > About This Mac. Amazon currently lists its USB File Manager as supporting Intel Macs and Apple M1 through M3, with macOS 12 or later. If your MacBook has an M4 or newer chip, the app may still work, but it is not covered by that published compatibility list.
You can quickly separate a cable problem from an MTP problem through System Information. Hold Option while opening the Apple menu, choose System Information, then look under USB while the Colorsoft is connected and awake. If the Kindle appears there, the Mac can physically see it and another cable probably will not solve the software issue. If it does not appear, try the cable supplied with the Kindle, another USB port or adapter, and a direct connection rather than a hub.
For ordinary EPUB books, I would stop troubleshooting USB at that point and use Send to Kindle in a browser. You do not need Calibre or the Mac app for that route. The browser service accepts EPUB and several document formats, converts where needed, and currently allows individual files up to 200 MB. It is less private than a local copy, but it avoids MTP compatibility entirely.
If keeping the file off Amazon’s servers is essential, then an MTP manager is the remaining practical route. Use only one transfer program at a time, copy an already supported file into Documents, disconnect cleanly, and give the Kindle a moment to index it. I would test with a small PDF first. That confirms the connection and destination before you spend time converting a whole collection. An EPUB is a poor test file because it can copy successfully while still being unusable as a directly sideloaded book.
Nobody’s pinned down what format your files are actually in, and that decides the whole approach. EPUB, PDF, AZW3, old MOBI, they don’t all behave the same on a Colorsoft, and half the advice above only makes sense once you know which one you’re dealing with. If you’ve got a pile of old MOBI files kicking around, be warned that the newer Kindles quietly dropped MOBI support, so no amount of clever USB copying will make them open.
@its_gadget is right that copying isn’t the same as reading. That’s the trap people fall into. A file lands in Documents, looks like a success, then never shows on the home screen because the format was never something the device could parse. So before you spend an hour setting up an MTP bridge, sort your files first.
Honestly, my take is you’re fighting USB harder than you need to. Send to Kindle over wifi handles the conversion and the transfer in one go, and it skips the entire MTP mess that’s making your Mac ignore the device. USB only earns its keep when you’ve got large PDFs or a lot of already-compatible files and don’t want them bouncing through Amazon’s servers. For that specific case MacDroid does the job of exposing the storage in Finder, and I’d treat it as exactly that, a plumbing tool for moving compatible files, not a magic converter.
One small thing that trips people up even after everything’s set up: the Colorsoft can be slow to index sideloaded files, so if a supported PDF doesn’t appear right away, give it a minute and check under Documents rather than assuming the copy failed.
Don’t assume an .epub extension means the book can be transferred. If it came from Apple Books, Kobo, Adobe Digital Editions, or another store, it may contain DRM. Neither an MTP app nor Send to Kindle will make a protected file readable on the Colorsoft.
Before troubleshooting the USB connection further, test with a small, known DRM-free PDF. If that copies into Documents through MacDroid or OpenMTP and appears on the Kindle, the cable and MTP connection are working. The original ebook file or its format is then the problem, not the MacBook. If even the PDF fails, check System Information under USB, close every other transfer app, and reconnect directly without a hub.
For DRM-free EPUBs, Send to Kindle is still the least troublesome route because it performs the conversion. For local USB copies, transfer only files the Kindle can already read, and use small batches rather than dumping an entire library at once. MTP can be vague about whether a large copy has actually finished, so wait for the transfer app to complete before unplugging the Kindle.
Use a private Dropbox or Google Drive folder instead. Upload your PDF or AZW3 file from the MacBook. Open the share link in the Kindle’s browser, then tap Download. The book should appear under Documents after indexing.
This skips USB, MTP apps, Calibre device detection, and Amazon’s conversion service. Test with one small PDF first. Keep EPUB files converted to AZW3 before upload, since raw EPUBs wont open directly.