I'm using Prestashpo with the module JA marketplace ([url removed, login to view]). The 'add a product' page is not working without problems. The main problem is the image upload function. On some devices, the image upload is not working. On other devices or browsers the upload function is working, but not smoothly.
I want a php developer to optimise or rewrite the image upload function on this page: 'add a product' and this page 'edit a product'. See screenshots for the current php codes.