Currently as per help.appsheet this is all that is possible
" Each image file name is prefixed by the key of the row being updated, the column name, and a short representation of a timestamp. The structure of the filenames is not changeable. However, you can use a computed-key if you would like to have more meaningful names for these files."
I would like to add some column name to the image path to make it more meaningful like a month column or add some short text to path etc