InDesign file for quote does not include all the source text

Hello,

I'm quoting an indd package which includes the idml file which have been sent by my client and which I plan to translate in Trados Studio 2019 and laying out in InDesign 16.

I've created a mock project from an empty Word file and then analysed the idml file (for translation) and the pdf file (for comparison). I've checked beforehand nearly all the boxes in the Indesign filetype options.

My idml file in Studio does not include the text from the embedded pictures while the pdf file does. How can I retrieve this text in my idml file for my analysis and the translation process?

Thanks for your help.