Unable to validate uploaded Excel file extension in interface

RE: Unable to validate uploaded Excel file extension in interface

Stefan Helzle — Wed, 25 Mar 2026 18:02:04 GMT

Yes

RE: Unable to validate uploaded Excel file extension in interface

vijayasreevasureddye0335 — Wed, 25 Mar 2026 14:57:17 GMT

Shubham , can we use this document() function to retrive its properties for multiple file in Expression Rule ??

so we can use that to show form level validation?? if user tries to submit

RE: Unable to validate uploaded Excel file extension in interface

sreekanth_82 — Mon, 20 Oct 2025 15:01:21 GMT

You’re correct that touniformstring(local!excel) only returns the document ID and not the file name or extension. The recommended way to retrieve file details is to use the document() function, which works after the file is uploaded and stored as a valid Appian document object.

RE: Unable to validate uploaded Excel file extension in interface

Shubham Aware — Mon, 20 Oct 2025 11:53:05 GMT

Starting from 25.3, you can use the document() function in your interface to retrieve uploaded document metadata including the original file name and extension before submitting the form, allowing direct extension validation in the interface.

docs.appian.com/.../fnc_scripting_document.html

RE: Unable to validate uploaded Excel file extension in interface

Stefan Helzle — Mon, 20 Oct 2025 09:56:18 GMT

OK, so you try to upload a file outside a process startForm or a user input task. I do not recommend this pattern.

I think the document() function should give you access to file name and extension to do your validation.

RE: Unable to validate uploaded Excel file extension in interface

Miquel Lara — Mon, 20 Oct 2025 09:47:02 GMT

No, i'ts a Site, and a!submituploadedfiles() + a!startProcess() are working together correctly. already have a validation in the a!fileUploadField to display a message indicating that the file extension must be .xlsx.

RE: Unable to validate uploaded Excel file extension in interface

Stefan Helzle — Mon, 20 Oct 2025 09:06:53 GMT

Is this a portal page? If not, a!submituploadedfiles() + a!startProcess() will not work.

In general, find a pattern here: https://docs.appian.com/suite/help/25.3/File_Upload_Component.html#all-files-must-be-pdfs