Unable to pick xslt files when using the "Send xslt transformed email" workflow

[HalldorLyngmo]

When using the "Send xslt transformed email" workflow you have the option to select an xslt file. But when you try to select a file and submit nothing happens except there is a JS error in the browser console.

angular.min.js?cdv=1667401606:63 TypeError: Cannot read property 'value' of undefined
    at populateFile (umbraco.forms.js?cdv=1667401606:262)
    at Object.submit (umbraco.forms.js?cdv=1667401606:240)
    at a.scope.submitForm (umbraco.directives.js?cdv=1667401606:6569)
    at angular.min.js?cdv=1667401606:74
    at Object.d.<computed> [as action] (angular.min.js?cdv=1667401606:44)
    at angular.min.js?cdv=1667401606:74
    at angular-mobile.js?cdv=1667401606:270
    at Object.$eval (angular.min.js?cdv=1667401606:92)
    at Object.$apply (angular.min.js?cdv=1667401606:92)
    at HTMLButtonElement.<anonymous> (angular-mobile.js?cdv=1667401606:269)

Reproduction

Specifics

Tested on v7 and v8.

v8

• Umbraco 8.6.1
• Forms 8.4.1

v7

• Umbraco 7.15.4
• Forms 7.4.1

Browser
Chrome: Version 80.0.3987.163 (Official Build) (64-bit)

Steps to reproduce

1. Create a form
2. Select the "Send xslt transformed email" workflow
3. Try to select a xslt file at the bottom
   

Expected result

The file path to be saved successfully with the workflow.

Actual result

Nothing happens except an error so the workflow is not usable without workarounds.

---

This item has been added to our backlog AB#6636

[pmpontes]

I can confirm this issue. I've already encountered it twice, once with Umbraco CMS/Forms 7.15.5/7.4.1 and on 8.3.0/8.2.1.

I can confirm too - it actually happens with EVERY use of the File settingtype, even those in custom workflowtypes - I just raised #375 with some more details

[skttl]

I've got this in Forms 8.6.0 too

[skttl]

And 8.6.1

[skttl]

This workaround fixed it for me

But #477 is still bugging for me in 8.6.1

[warrenbuckley]

Fixed in PR https://github.com/umbraco/Forms/pull/417
Due for release in 8.7.0

[JoakimValtech]

This workaround fixed it for me

But #477 is still bugging for me in 8.6.1

Thank you! You saved my day! You're a hero