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HELP!!!!!!

I mistakenly deleted several tabs and parts in a document and left only one part to work on. That was when I found out my big mistake. I can see the previous version with all that I deleted, but I can only see the original version, but not edit or recover. Is there any way to save months of work on this project?
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Any change made within a document is recoverable. If you can see the previous version that you want to recover, you can restore to it.
If you've clicked into the target version (viewing it) the restore option is at the top of your graphics area. If you're in Main, you can right click the target version/microversion and chose restore.
https://cad.onshape.com/help/Content/restore.htm
If something else wacky is going on, please post a screenshot or submit a support ticket!
Try restore to main from start or what ever version you have before the mistaken deletes. Make sure main is selected then right mouse button over previous version to restore to main.
Thanks a lot, gents!! I can breathe again.
Another great reason to why the industry will transition away from file based workflow. ha.