Karin on my OpenOffice the option to choose is not a "save as" it is in a slightly different place (I have an old version & hardly ever use it anymore) so look around - it may read "transport as" & choose PDF.
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Rozanne & Sunday
July 02 2019  Larimer County, Colorado
case history:  https://ecir.groups.io/g/CaseHistory/files/Rozanne%20&%20Sunday 
photos:  https://ecir.groups.io/g/CaseHistory/album?id=93586