During the Karlsruhe Hack Weekend hosted by Geofabrik, I made it possible to upload more than just one GPX track or Umap export file per MapOSMatic map render request. The screenshot shows a preview with three GPX tracks, colored in red, green and blue.
The file upload user interface has also changed slightly: instead of separate form tabs for GPX and Umap files, there’s now just one form tab where multiple files can be uploaded. The file types will be auto detected now so there’s no need for multiple upload tabs anymore.
The code still needs some minor polishing, but all the major steps are in place, so it will probably go live on the public instance tomorrow …