I have added a new section to the Real-World appendix of the manual.
It consists of adding a frame to a Picture in Picture and is based on
a post in our forum. I enclose the latex file with image and also the
text in odt for those who would like to review it. See if it is OK for
you.
Link to the files:
https://ufile.io/zfshf1ct
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note link will expire in 30 days
I read txt on proxy files, but only 'error' I saw was missing space between two words, may be due to tex -> txt conversion or my android viewer.
"Check thatFile Format is set to FFMPEG." between that and File. (may be there was space as some special symbol?)