Dynamic Media Classic
Viewer presets are listed correctly on my AEMaaCS instance.
However, when selecting any viewer preset and clicking on edit then the preset editing page loads indefinitely.
There is a correct dynamic media configuration under
What is missing to get the viewer presets editor to work correctly?
Something went wrong with the initial DM setup. In order to correct this, you need to re-run the DM Setup Asyncjob.
artwork/cssfiles to DMS7. It can take a few minutes to complete. After it has finished, log out, and log in again, and the viewer presets should be editable.