Studio screen capture not working

Hi. Canvas Studio screen capture seems to have stopped working on my Mac today. It was working fine prior. Now it asks me to download the application (which I have done several times) but it still do...

Uploading custom thumbnail to Commons

Hi. I'm having difficulty uploading a thumbnail image to a Canvas Commons resource. I managed to do it once but when I deleted the old module and uploaded the new one, then tried to upload ...