We are getting this error in our project:
“The following assets have been modified and cannot be unloaded:
/ProjectRealm/ExternalActors/ProjectRealm/A/LX/DMBPFEIK6FM6TMWJ576VH7
Saving these assets will allow them to be unloaded.”
But there is nothing showing in that folder path on either of our ends. A team mate can’t sync any changes at all because of this error.
Anyone else see this pop up or know of a fix?
Similar question, mine happened after force delete some material instance assets be using in “auto save” level, then the warnning window showup everytime when I use “save all” command to saving the “auto save” level can’t be saved, it’s really annoring and the “auto save” level basicly lose its useful at same time.
you may need to just fix up your redirectors!
sometimes force deleting breaks connections
Thank you for reply!
I tried to fix the redirectors, and the pop-up window ask me to save all the “auto save” level to static assets before fix the redirectors, if not, the fix process will stop, if do, I got a lot auto saved levels in my content browser, and I have to delete them after the fix done, it’s still annoying. 
Maybe I should disable the auto-save to avoid it happen again.