After installing the plugin it worked for some days. Than it became increasingly buggy (after trying a bulk change). after that it stopped working at all. For example when I try to apply a watermark to a single image the gear keeps spinning. Uploading new images is no longer possible it gives either a HTTP error or “an error occurred”.
Tried several variation of the configuration, without any positive result. Only disabling the plugin will permit me to upload further images.
I know it hasn’t been tested with the latest PHP / wp version, yet it would be great if it could become functional.