What's a good way to host an SFTP server on an Android device? I used to see ES File Explorer recommended for this, but that company got banned from the play store for bundling shonkware, so not touching it with a ten foot pole. I installed Ghost Commander but it seems it can only act as an SFTP client (unless I'm missing something.)

BTW I want it to act as a server only on wi-fi and only when I have the app open and running, for obvious reasons... No background serving!

I'm FINALLY replacing my Galaxy SII with something more modern. It is only with great regret - just kidding, I hate that thing, but I've been dragging my feet for years because it means having to lose USB mass storage mode & the 'current' MTP method sucks donkey nuts all over. Looking for the next best thing to mitigate the aggravation.