I need to transfer file attachments fields to new app. I downloaded info into a cvs file but I am not sure the file attachements are there

You would need to run a script to move the actual file.  If you don't have access to / or budget for that, you can make a link from the old records and bring that over for legacy data.

As long as you don't delete the old files, you can use this;


URLRoot() & "up/" & Dbid () & "/a/r" & [Record ID#] & "/e87/v0/"

(the e87 is the field ID of the file attachment)
Create this formula URL in your old app, and add it to the CSV that you are exporting.  Then the users in the new app can click the 'link' and download/view the document.

Also enable the checkbox to allow access without logging in.  That way if new users don't have access to the old app, they can still use it in the new app.