Photos Produced From Smartphone Or Pad Touch Sreen Apps Such As Paint Joy Pro

Hi all. What fun this is! Most of my "paintings" are made using my finger on my touch screen smartphone. My camera on my smartphone is 8. When I order enlarged prints bigger than a 5x7, the notice always comes up that they can't be made larger. I have bypassed this and have found that my pictures can be made very large with no compromise to the painting. Of course a lot depends on the piece itself. Some of the app brushes and sizes won't work, but I have found that the majority do. The largest I have had my work enlarged by both Costco and Staples using a large format printer is 30 x 20 and they come out beautifully. However, when downloading them for FAA, the largest print it says I can made is the smallest. I'm not sure I can do anything to enlarge my work on my phone, but I will explore that option. The option I am given on Paint Joy Pro is PNG, which is higher quality than JPG.

Because this is a new medium and enlarging the work isn't the same as enlarging a photograph taken of a drawing or painting, I think the "no enlarging" rule shouldn't pertain to this particular mediium.

Is anyone else out there working in this medium? It is not exactly the same as digital, or is it" I do not take photographs and draw over them, I use paint brushes, pencils, special effects chosen from Paint Joy Pro. Has anyone else had this problem and resolved it on their phone prior to downloads to FAA? Thanks in advance. I am including a piece I've done so you can see when I'm talking about.