The "problems" with the sd card is mainly due to the android 6 which changes how it is accessed or not. There have been reported problems with calibre companion & putting its library onto an sd card with android 6 tablets. Evidently, it is 'solved' by having the android 6 tablet format the sd card so that android 6 know that it is identifiable by android 6 & grants permissions.
I also had the problem with an android 6 tablet with CC I wanted to move the library from main memory to the sd card when CC had the ability to use CC library from the sd card. Only had permission to read data, no write. I changed the permission with total commander, was done "OK" but android 6 did not really do it so the data & directory remained read only.
I am more nervous with the android 8, Oreo, as that is sandboxing apps like the crappy ipad. Read Google wants app updates to play store target the "current" version of android; this means android 8, for now & android 9 next year! My tablets are stopping at android 7.
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