Images (png) with a filesizes (far) lower than 4 MB are actually rejected to upload. [Solved. Caused by a server upload lmit]

Since the begin of Gancio I noticed, that my PNG image uploads of moderate sizes (1,1 MB or 1,5 MB or so) are rejected with a wrong error message saying that upload images must be smaller than 4 MB[sic].

Please allow uploading images with up to 4 MB; these images could be downscaled on the server (imagemagick/convert) if needed.