I now have the problem for the second time (the first time the file just reappeared, but then it was shown to me in the folder preview.) The one drawing after I saved it at Krita (with name and as a krita file) simply has completely disappeared (also the cache + the security files that I always save myself). I use an Acer laptop with Windows 10 and the latest version of Krita (with a Wacom Intuos). If anyone knows what the reason is, I would like to hear a few ideas!
(It is simply demotivating if you notice after 10 hours that everything was free…)
They are probably not gone - googled what critique files are supposed to be and the first find will probably answer your question.
Unfortunately, they are nowhere to be found. It's not about saving myself, I always do it properly. Would you at least be a jpg. File there, it would be less bad. But nowhere is there a single file of the drawn one. (Although several versions of the one save file were created, i.e. Sketch (2 files), lineart (one file) and finally the colored file (only one).)
It can't be that EVERYTHING disappears without a trace…
(I didn't have the problem with jpg files)