Using Moodle 3.6, we have the following problem:
- Students upload a PDF that has been signed by a teacher on an iPhone using the app "SIGNificant"
- The uploaded PDF displays normally when downloaded
- When viewed in the single grading view, with annotate PDF feedback enabled, the signature is not displayed
- When the PDF is annotated, the signature is missing from the saved annotated PDF
Could this be an issue with Ghostscript or the used iPhone App, or is this simply a common behaviour for signatures on PDFs?