Finally worked out an answer, with the help of other community members.
I still have this thread open and haven't gotten any responses.
Wondering if you have any thoughts on a solution to getting the image to appear?
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How do I get an image from a Power Apps gallery to appear in a saved PDF?
I am using the following formula with the accompanying flow to save a Power Apps gallery as a PDF in a SharePoint Library.
Set(varEmailTemplate, PDF(Email_Gallery));
SavePurchaseOrderasPDF.Run(Email_Cutomer_Name_Fld.Text &"-"& Email_Machine_Model_Fld.Text &"-"& Email_Reference_ID_Fld.Text & ".pdf",
{
file: {
name: Email_Cutomer_Name_Fld.Text &"-"& Email_Machine_Model_Fld.Text &"-"& Email_Sold_Date_Fld.Text & ".pdf",
contentBytes: PDF(Email_Gallery)
}
}
);

The PDF file is saving to the library. I am getting everything but the image from the Power Apps gallery. The image control IS within
the gallery.
View of Power Apps Gallery -

View of Saved PDF -

Both of the following formulas return an image to the Power Apps screen image control.
Note: The image property, using both formulas, shows 'None', even though an image does appear in image control.
Edit_PO_Device_Image.Image
//LookUp(Machine_Image_Collection,Model_Name in Edit_PO_Model_Fld.Selected.Value).'Thumbnail ({Thumbnail})'.Medium
The source image control, from the main screen - where the 'Edit_PO_Devcie_Image' is located, is using the following formula.
Note: Its image property value also shows 'None'.
LookUp(Machine_Image_Collection,Model_Name in Edit_PO_Model_Fld.Selected.Value).'Thumbnail ({Thumbnail})'.Medium
