Hi @Anonymous ,
Based on the flow configuration that you provided, I think the solution I mentioned above is different from yours. Have you taken a try with the solution I provided above?
Do you pass a collection of images data from your app to your flow?
According to your flow's configuration, I assume that you want to create related image (.jpg) file within your SP Library based on the created SP List item, is it true? But within my solution, I recommend that you should attach multiple images files (pass from app) as attachments of the submitted SP List item.
Based on the needs that you mentioned, I think it is not necessary to store the image file into a SP Library, instead, you could consider attach the passed image files as attachments of the submitted SP List Item record.
I think the solution I provided above could achieve your needs, please consider take a try with it, then check if it is helpful in your scenario.
Best regards,