Samsung s9- had full storage, around 99%. Phone would constantly send me notifications to clear files. A new notification popped up that said it can optimize and move files to clear up space. I went ahead and did it and it said "don't worry, you can still access files once moved". I cannot find where my files are located at! It ended up removing all of my photos in my gallery.
I don't know where the files are that say Other that is using up my storage space most media files are on my sd card and Google drive and outlook cloud