pdf graphic in lyx file > converting error

[Wolfgang Engelmann]

I try to insert a pdf graphic in a float of a book document, but get 
/error converting in a loadable format/. What do I have to set in the 
tools>file handling>converters to make it work, respectively, in which 
help file and where there do I find infos? Its an older file (2016) 
which used to work. Has something changed in the meantime?

Wolfgang
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