Wordpress plugin: image upload error across various activity types
Apologies if this has been covered elsewhere on this forum. I've done a little bit of digging through likely looking threads, but couldn't find any posts that addressed my issue, and without a forum-wide search tool, it's hard to find stuff on here.
I have only just discovered H5P. It looks great and I'd really like to use it. I'm pretty tech savvie and clued up with Moodle and Wordpress and other LAMP based platforms, so I can usually troubleshoot things well for myself. However, this has me stumped:
After I got this error with a 1.2MB image, I tried other images (both .jpg and .png), all kinds of sizes down to 16KB. Same story for all attempts. I also tried this on two different Wordpress installations (one of them completely vanilla, just for the sake of testing this) on two different webhosts (just in case one of them had issues). Same result for both hosts. The issue isn't confined to the Flashcard activity either - any image upload fails.
I should add that media uploads through the native WP uploader (including all those test images) work completely fine, which suggests that this isn't a permissions issue on the directory (both the native WP content upload and the h5p upload directory are a 0755 as they should be).
I am clearly missing something here. But what?
I'd be really grateful for some pointers.
Thanks in advance.