Perfectly clear, thanks a lot!
I think I'll choose to fill in one filesize to fit all. That is a fine solution for me since I only use 3 file formats and somewhere in the past I've filled in 10MB for BMP files, 512KB for jpeg and png files. I simply set BMP to also use 512KB max and the issue(s) should be solved (for me, that is). I'll go and test this now.