This seems to only happen to me when I am attempting to post after having pasted in more than one (copied to clipboard) screenshot. This is the console log from my last attempt: Navigated to <a href="https://app.roll20.net/forum/newtopic/46806/7474530" rel="nofollow">https://app.roll20.net/forum/newtopic/46806/7474530</a> Form contains a file input, but is missing method=POST and enctype=multipart/form-data on the form. The file will not be sent. script-call-for-testers-universal-chat-menus JQMIGRATE: Migrate is installed with logging active, version 3.0.0 v2.js:57:368 JQMIGRATE: jQuery.fn.bind() is deprecated v2.js:57:127 console.trace() v2.js:57:176 n <a href="https://app.roll20.net/assets/v2.js:57:176" rel="nofollow">https://app.roll20.net/assets/v2.js:57:176</a> bind <a href="https://app.roll20.net/assets/v2.js:57:5151" rel="nofollow">https://app.roll20.net/assets/v2.js:57:5151</a> <anonymous> <a href="https://app.roll20.net/v2/js/browse.js:609:2" rel="nofollow">https://app.roll20.net/v2/js/browse.js:609:2</a> d <a href="https://app.roll20.net/assets/v2.js:51:8259" rel="nofollow">https://app.roll20.net/assets/v2.js:51:8259</a> r/</h< <a href="https://app.roll20.net/assets/v2.js:51:8564" rel="nofollow">https://app.roll20.net/assets/v2.js:51:8564</a> If I paste in one and then post, I can usually edit in more pasted images later. Still only one at a time though.