When you create a version, you can treat it like make a copy of the project. and each version is independence, you can edit each version document without impact other versions.

Hi, I'm reporting a bug in how the versioning system works for multiple users. Multiple users working on the same project cannot work on different versions. This is a very important limitation, and is very confusing and causes errors in how documents are updated, as the version could change for one user without his knowledge. I'm not in doubt how a versioning system works. /thanks

Yes, the user can not edit different versions at the same time, it is limited on purpose, because of the data storage and our version control is following document historical. it must have a document ID(only one), and then find a historical ID(many) to get the current file. when you change the version, the new historical must be saved in the current version, otherwise, it doesn't know where it should be going! you can see below image: 

Hi. Sorry for the late response. I know one user cannot edit different versions at the same time. This report is for multiple users. Please read my report carefully. Two users, one project with more versions stored. User A selects version 2 of project A, edits something. User B selects version 1 of project A to view someting. (User A dont know of this version change.) User A saves his edits to project A. My question is now: Which version would anyone expect user A to save his edits to ? I would say version 2, but this is not what happens. User A edits are saved into version 1, making version 1 invalid.

@maximumiq I know what you said, it is a kown issue, at present, EasyEDA doesn't support this feature. Which version would anyone expect user A to save his edits to ? User A can not save his edit, the document saving must match the active version.