Hi everyone! 
First I’d like to welcome some of our new posters to the community.
I totally understand how frustrating this issue is. This is certainly not the kind of experience we want people to have when using Postman.
When logging into a Postman account, all of your collections are supposed to be synced to your account. You can check this by looking at these links:
- https://go.postman.co/me/collections - Personal collection
- https://go.postman.co/team/elements?type=collection - Team collection
From what I have seen, it seems that logging out and logging back in can restore your missing data.
For those using offline/local data, you can try recovering it following some of the info on this resource. Scratch pad may be what you’re looking for!