Having tried various exports from Affinity Designer (AD) to import into APub, I have found that a PNG keeps the AD export color and tone best. The TIF export is very problematic in terms of tone. The PDF is beautiful when exporting from AD beta but when importing into APub it becomes very dark in tone. I can alter the opacity but in doing that I lose much of what I worked so hard to achieve in APhoto. I've tried replacing the imported PDF and the result is the same. Is this a known problem?
Here are part of the PDF as it came out of AD and as it looks when imported into APub.
PDF Export from AD
PDF Export as it a ppears in APub