Weird, you should be able to see this when you drag and drop an image into Dynalist:
Regarding Google Docs, I don't know your exact syntax, sharing that would help. Normally you want to upload to something like Imgur, or Google Drive, since Google Docs is for documents, not images.
Lastly, this post should probably belong to the "Help" category, unless you want to add more details to the bug report (you should see the bug report template when you posted this). I hope that's understandable!