Any file size limit for uploading a single image?
I found that to save image as *.sur file has much smaller size than *.fibps file, I've uploaded 7mb sur file successfully, hope it helps.
For some stitches images, you may want to resample the image to make it a more manageable size before uploading.
I also learned that there is no file size limit for ProfilmOnline images but performance will be reduced with larger images. On mobile browsers (phone, tablet), the memory and processor may limit the size. This limit will be device-dependent.