I want to use my instagram images (direcly get the url-s, automatically) to create a url database on which to base further development i.e. create metadata = detect the presence of faces (or do that manually), and then have transparent box/buttons around the faces based on that.
I know there could be problems with changing url-s, but let’s forget about that.
Thanks for any advice.
Hi @lucchateaudifgq, welcome to the community! 
Before you proceed with this app you should consult the Instagram terms of service. It might violate the ToS to build something like this.
The nice thing about Thunkable is that you can create a lot of the functionality for yourself. In the case of Instagram, we have a full tutorial on our YouTube channel on how you can build something like this: