I have exported around 100 sessions from fiddler into text file like, File
-> Export Sessions
-> Selected sessions
-> Raw files
Now I have a file that is 15MB and holds information with requests and responses that are separated by a line of dashes (----------------------------------
).
How do I import these sessions back into fiddler?
Export Sessions > Raw Files doesn't do that-- it exports the HTTP response bodies as individual flat files, dropping all headers and requests entirely.
If you chose File > Save Selected Sessions > As Text, you'll end up with a text file in the format you describe. You cannot, generally speaking, reimport such files into Fiddler because text is a lossy format.
If you want to keep traffic for reloading in Fiddler, the default Session Archive Zip format is your best bet, although export/import of HAR format is only somewhat more lossy.