You can automatically do things using automation. You can automatically upload an attachment using an update record automation action. You may need a formula
Hey @Eren1 this is a pretty quick automation. I'll take you through how to set it up:
Sample Base Layout (and desired result - example URL turned into attachment):

Automation Trigger - When URL Field In Record Is Updated

Automation Action: Update Record - Update attachment field with URL from URL field

Done! Let me know if that worked for you. May need to adjust the trigger based on your specific use case and how your data is input/updated.
Issue I had was that I thought that it would not be possible with a formula field. My bad. Somehow it was greyed out. But it sure works.
I created another automation to created the missing attachements since I already have a pretty long list.
Couldn't think of a better way.


Thanks a lot.