Quote:
Originally Posted by JSWolf
You do not have access to the system directory. So the covers cannot be put on to fix things when you turn on WiFi and Amazon deletes your side-loaded covers.
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MTP issue has nothing to do with MacOS per se, which doesn't know anything about it. Linux is similar as I understand it.
It's up to the MTP clients to behave well, and there are not that many to choose from. OpenMTP is pretty stable and developer is pretty responsive to fixing issues. Send To Kindle for macOS has a USB file manager but it only works with Kindles that use MTP. Calibre only manages book transfers and is not a general purpose MTP client. LibMTP (which is what calibre's support is based on) functions as library for things that can link to its object code and has a 'demonstration' CLI which you can use for command line transfers and queries. Android File Transfer can be found, but seems to ignore the preference to not run as a startup program so you have to use kill command or Activity Monitor to kill the process when you want to use a different MTP client such as calibre.
The only time you will see covers for side loaded books on Colorsoft is if the metadata matches up with an Amazon title, then it will download a thumbnail for it (and X-ray, popular highlights etc.) when you sync.
Since there are no thumbnails in the first place, they cannot disappear.