
Hi @eg1995 ,
For your questions:
1.Can I upload as a first step revit and autocad files to my sp online site and make the files available for everyone?
Yes, you can upload revit and autocad files to the Sharepoint online site as a first step. And make the file available to everyone you want.
2.If yes, after having the files available, is there any chance that the files can be opened through web apps? If no, only option would be to download each time the file and work in on locally?
Yes, the files can be opened through web apps(As shown below).
3.Or to sync the site to each user device, and then each time they want to edit they just access it from their devices, work on it and automatically changes will be reflected to the cloud?
You can sync all files to each user devices with one click through Onedrive. Then every time they want to edit, they just access it from their device, work on it and save it, automatic changes will be reflected to the sharepoint site.
4.Lets say the syncing work, if user A and B have access to the same files and they are editing it from their devices simultaneously what would be impact of the synced file to the cloud? Will it have different versions or what?
Yes, when multiple people edit the same file that is synchronized to Onedrive at the same time, Onedrive will automatically synchronize the file to the sharepoint site and store it as different versions.
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