File upload isn't working on my card form embedded in an app

In the single question style is greath for mobile applicantions.

But i have a problem, when i include the file uploader doesnot works fine emebebd in some aplications, the reason dont have the "single file" option. The normal view, yes have this option.

When the form is embedded in the app, I'm afraid the file upload field won't work for the classic or the card form. It is highly likely that the software you used to create the app does not permit or lacks the resources for HTML forms to access the device's file system.

However, if you think the native single file upload worked in the classic form, you can try any of these widgets in your card form but I'm guessing it won't work since they are advanced file upload but it's still worth a try.

https://widgets.jotform.com/search/file%20upload