Unable to upload a file in login flow

Question

Is there a known issue with file upload in flow login?

Because, I don't have problems in upload a file with the same flow attached to a record page, but when is inside a login flow the same flow is unable to upload any file.

I use a file upload component for upload the file inside the flow. I used also a lightning:fileUpload component in aura component with flow but have the same results.

Seems there are no security problems in fact the same user can upload a file in the record page with the same flow.

Thanks in advance

EDIT

how to reproduce the error:

I tried this in two orgs, create a partner user and assign to them a login flow to be launched when he accesses to the partner site.

The login flow has a file upload component or an aura component with a lightning:fileUpload component, in my case the fileUpload will upload a file in the contact record associated to the partner user.

When you try to upload a file with this partner user an error will occur.

I tried the same flow in the page record contact of the partner user and it works fine, so it is not a problem of access and permissions. And the user is logged in so there is not a problem with guest users' accessibility

EDIT 2

In the browser console nothing gets printed and also in the apex debug with all fine nothing loads.

I found a workaround for this; but maybe someone can find a better solution.

Answer 1

Just create a html input tag:

          <input
            type="file"
            class="slds-file-selector__input slds-assistive-text"
            accept="image/png"
            id="file-upload-input-front"
            aria-labelledby="file-selector-primary-label-105 file-selector-secondary-label106"
            onchange="{!c.onChangeInputFront}"
              />

to retrieve the file via controller, do:

const inputFront = document.getElementById("file-upload-input-front");

    for (const file of inputFront.files) {
        // do your things
        console.log(file);
        helper.uploadHelper(component, file);
       }