FTP access to Android devices for file management is becoming more and more problematic. I used a Store app, primitiveFTP, for years but Google has recently refused it all files access, so it is not very useful anymore. Paradoxically it seems to have allowed it in a similar app called WiFi Pro FTP - so why? Every time we get more shit like this from Google I despair more. Luckily I only have a few years left to cope with this before sinking below the surface in a slough of despond.
en.wikipedia.org