BTW, in one of your posts you asked about a "workaround". I think what you meant
was an alternative to MTP?
This may or may not be related to the OP's issue, but for some reason, the simple-mtpfs package is not installed by default on Fedora. Without this, MTP doesn't work. With simple-mtpfs installed, I can use file browsers such as Nautilus to see the files on my relatively new (Galaxy S6) Android phone. On my ancient Amazon Kindle Fire HDX tablet, I have never been able to make file browsing work, but I have been able to copy books on and off the device using Calibre.