2020-06-24 09:19 PM
2020-06-24 10:43 PM
Which kind of warning ? ... without more details quite hard to help you ...
Have a look to your workspace <workspace>/.metadata/*.log ... did you get trace of something here ?
Which kind of file have you lost (100% end user custom file or some source generated by STM32CubeIDE) ? If generated file which one (file location & name please) ?
Which IDE version & operating system are you using ?
I fear no way to recover lost ... but cannot imagine you're working without source control management solution (GIT, SVN, ...) so here is way to get your file back.
2020-06-25 07:08 AM
You can right click the folder -> restore previous versions to see if Windows saved a copy. If not there, check the recycling bin. If not there, it's lost without a great deal of effort.