Import an SRT file
Then on the same line as the language you wish to import the SRT file click on the 3 small dots button on the right.
And in the dropdown menu click on "Import SRT".
Then you will be able to import your SRT.
Note that by importing your SRT file the existing subtitles will be overwritten and there is no way to recover them. We invite you to export your project as an .srt file if you wish to keep it.