Insert Image Copy and Paste

Insert Image Copy and Paste

Working with Zoho Docs for collaboration on editing a paper with multiple authors as well as using WizCiteWeb. I typically will do a screen capture on OSX to grab a figure and was able to copy and paste into the doc using Firefox. Everything seemed to be working. Images showed up etc. Came back to the doc a week later and the images were gone. What I suspect is that I probably rebooted the computer so the local clipboard reference was gone. After inserting an image my expectation was that Zoho Docs would treat that as data that needs to be sent to the server as part of the document. 

Am I missing something?

If I use the Insert Image feature and select a file will that be uploaded to the server and retained?