ScreenFlow displays a Save As dialog, where you can name the file, select a location, and save the file.
To Import an SRT file, select Edit > Captions > Export to SRT, then pick the SRT file you wish to import. In the file dialog window you can select the language of the caption file.
The imported SRT file is parsed and captions are generated for each entry. If there are any existing captions for the imported language, they will be cleared before the import. The import always overwrites any existing captions and does not merge them.
If there are any gaps in time between captions in the imported SRT file, spacer captions will be inserted to keep the captions in sync. ScreenFlow imports the captions into the first audio clip on the timeline, if the captions are longer than the clip, they are not split onto other audio clips.