Windows 7 64Bits / LibreOffice 5.1.1.3 /Samba windows Share on server.
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Create an empty calc Spreadsheet
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insert > hyperlink > Document > Path \server\share\image.jpg
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Save SpreadSheet as xlsx on \server\share\test.xlsx
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You can click on that image and you are able to display.
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close and open test.xlsx again
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you are unable to open it.
If you save as Excel 97/2000/2003 (xls) you would be able to open it without issues. There is a bug report with relative info https://bugs.documentfoundation.org/show_bug.cgi?id=45435
Same question in Spanish Calc 5.1 no guarda los hiperenlaces a Samba Share en formato Excel 2007 XML