Snippets missing when uploading to Youtube

My slideshow is fine when viewing on my laptop. Upon exporting to Youtube it seems the snippets (Exposition) are missing. The text overlay is there but the slash thru circle appears where the snippet should be. I shared from Fotomagico to Youtube which I assume is the way to do it. I saved it at the lowest video 480P so it would upload faster. Of course the results were pretty poor. Anyone have this problem with snippets not uploading? Thanks.

Please can you provide a screenshot of how the slash thru circle looks like? Which version of FotoMagico and wich version of MacOS are you using?