Other issues
You can't untick internal storage and SDcard folders at the same time. You have to OK main Device dialog and restart Calibre.
I mounted a main filesystem folder and connected to it with the Android tablet disconnected. I put PDFs in PDF and epubs in ebooks in that folder, exited Calibre, "Continued" the gvfs-mtp-monitor and connected the tablet. Copied files to SD card. Double checked nothing on Internal Storage. Ejected and connected to Calibre. Calibre detected the new PDFs and ebooks but shows them in "Main".
Sending to "Main" actually sends to SDCard. Shows as sent to Main. Sending to Card A fails.
The MTP for actual transfer is about x2 speed of the SD Card mounted in a USB reader, no doubt because reader is a cheap USB 2.0 and tablet is maybe using USB 3.0 (USB-C cable to a PC USB-C USB 3.0 port).
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