Any time I attempt to load an image into the downloaded version of the program's library, I get this error, and am unable to add images.

I also cannot import or export NPCs. Exporting doesn't give me an error, and importing gives me ERROR: Failed to execute 'readAsText' on 'FileReader': parameter 1 is not of type 'Blob', but still imports it anyway.

Making the character/npc/whatever on the website and then exporting/importing it into the exe version is the only way I can get images.