Hello,
Thank you for posting here in Microsoft Community.
Basing on your description, you are trying to create a meeting minutes template using the Microsoft Loop, which does not offer you to upload your own file but provides you stock pictures instead. Just to set your expectations, that Microsoft Loop is still in preview or development stage, which it may lack certain features. I assure you that our Loop engineers are continously working on improving it.
Just to confirm if I got the your concern right. Are you referring to this feature?
..
If yes, I am afraid it's currently limited to this stock images. What I highly suggest is you can send feedback to the Loop team by doing this:
- In the bottom right corner, select Help> Give feedback.

- On Android or iOS, tap your profile picture at the top left to find Help and feedback.
Best regards,
Arquel C.
Microsoft Moderator