Looks like you can't upload any multimedia (gifs/videos) above 100 KB? In addition to the fact that you can't upload any images above a couple megs this just seems weird.
A BIT OF AN ISSUE WITH PICTRS: PNGs and JPEGs under 2 megs are the only files that can upload.
Anything that's not an image file, or over 2 megabytes in size will give some JSON error.
:(