You may have seen this video on YouTube about Affinity Publisher Beta v. Adobe InDesign. which is in my opinion a massive fail. Affinity Publisher isn't a copy of of InDesign. It's a different operation concept. Think different!
I really like what I've seen and tested so far in APub - very good job!
To solve the problem of the video I've nested picture frames inside the beautiful symbols and with one click you've added a picture to all linked triangles as shown in this demonstration: