MASTER and child documents questions Lyx2.4.0dev

[Wolfgang Engelmann]

in the appendix are a MASTER.lyx and two childs (CHAPTER01.lyx and 
CHAPTER02.lyx) and a bib file.
Several questions:

-is File>Export>Lyx-Archive working for master/childs??

-Under formats (output format) 'Put fragile content out of moving 
argument' in the MASTER. what does it mean and is it needed also in the 
childs?

-in the childs there is a warning in outputting it to pdf >
Included file `~/Dokumente/PUBLIKATIONEN-EIGENE/A-SP-2022/CHAPTER01.lyx'
uses input encoding "auto-legacy" [Direct]
while parent file uses input encoding "utf8" [Direct].
For both childs. Where and how can I remove this error?

- Where do I have to place the bibliography in order to get the 
bibliography in the pdf file? At the time being I have it in all three 
lyx files, but not pdf output

Note that I use a special Bibliography setting biblatex-spbasic (but 
available in the menu there)

I use Debian and Lyx2.4.0dev and Jabref for the bib file

Wolfgang
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