Hi! Welcome to community!
You can achieve this in 2 ways:
Classic Design Experience:
As @Rahul_Unnikrishnan Mentioned you can get the url using get attribute activity.
Find the attached image below for your reference:
Modern Design Experience:
As @Anas_Pv Mentioned you can get the url using Get URL activity
Find the attached image below for your reference:
Regards,
NaNi