This is the second time this happens to me and its starting to get annoying i told myself you should save it into another project just in case just like the oringnal once but thats what i get for being stuburn… i shouldnt have to make three or 7 projects to keep by data from being lost. 7 months work and also character building lost in a map is heart shadering.im on a tin line leaving unreal engine and going to unity or another engine. i really love this engine but to under stand my feeling about it. ill use Epics quote “when you really love somthing you should set it free”.
My Map(Level) File Disappeared i didn't move nor did i touch it in anyway. i even saved it before closing out the project this morning.
Have you checked for any hardware/ disk Problems? Also, Was the save file in an external disk?
I had and i am still having the same problem . If its you map file . Try opening it in another project . If it works that means its not corrupt . Then Copy it to your desktop and delete it from your content folder . And close the editor And Rerun it . after that Close it again and Copy your map File back to your Content Folder but in a different folder . This Worked for me . Anyways . Always keep a backup of your project