Power Platform Community Forum Thread Details

I am creating an app in Power apps and I am using a vertical gallery that gets its information from the sharepoint. I use a pdf viewer with a fx

If(
    Last(
        Split(
            Gallery3.Selected.bestaandnamextensie;
            "."
        )
    ).Value = "pdf";
    "appres://datasources/Documenten/table/************" & EncodeUrl(Gallery3.Selected.'Volledig pad' & Gallery3.Selected.Bestandsnaamextensie);
    Substitute(
        Gallery3.Selected.Thumbnail.Large;
        "/thumbnail";
        "/pdf"
    )
)



I can see docx and excel files in the pdf viewer but not pdf. I'd be happy to receive some advice. Thank you.

Categories:

Building Power Apps

Hi @JJ-27020844-0,

In your formula, the PDF branch builds an appres://… URI:
"appres://datasources/Documenten/table/************" & EncodeUrl(...)
appres:// is an internal app resource scheme, not HTTPS. The PDF Viewer only accepts HTTPS URLs or binary PDF content. Hence it refuses to load it.

Your non‑PDF branch uses:
Substitute( Gallery3.Selected.Thumbnail.Large, "/thumbnail", "/pdf" )
That returns a proper HTTPS preview endpoint (via Microsoft’s viewer), so it works.

Fix: give the PDF Viewer a real HTTPS URL (or binary content)

Your formula rewritten (simple version)
If(
Lower(Last(Split(Gallery3.Selected.Bestandsnaamextensie, ".")).Value) = "pdf",
// Build a real https link to the pdf file:
"https://contoso.sharepoint.com" & Gallery3.Selected.'ServerRelativeUrl' & "?download=1",
// For Office docs, use the pdf rendition endpoint:
Substitute(Gallery3.Selected.Thumbnail.Large, "/thumbnail", "/pdf")
)

Replace https://contoso.sharepoint.com with your tenant/site origin.

✅ If this answer helped resolve your issue, please mark it as Accepted so it can help others with the same problem.
👍 Feel free to Like the post if you found it useful.