I've noticed that while trying to make a game, I like to use my own sprites and sounds instead of the pre-existing stock ones. However, while I do have a few custom files of my own added to my game, It won't let me add any more. I click on the “upload sprite from file” button, the page freezes for a moment and then nothing happens. I've tried this on another computer and I've gotten the same results. I've also tried deleting the files from the game I decided not to use and nothing has changed. Am I doing something wrong, or is there some unseen limit I'm unaware of? Thanks in advance for any help.

My browser / operating system: Windows NT 10.0, Chrome 69.0.3497.81, Flash 31.0 (release 0)

How many sprites do you have?

Only two, not including the background. All are from my own files.