okay so what happened was when I would try to upload a drawing it would give me this message
I tried saving the image file as a PNG and then I tried to save it as a Jpeg, but it still wouldn't work.
what I have to do was import it from MediBang Paint (the program which I mostly use to draw) to YouDoodle (a program that is not as good as MediBang) and then try to save it and then upload it, and finally worked.
I've been having a bad day today so at least one good thing happened