download of image (generic file?) fails if identical filename present locally (OTF filenames)

[labor4]

Description

Browsers support the download of files whose filenames are defined in the download attribute of the link, and whose source filenames are supposed to be discarded in favour of that attribute content..

This fails when [filename already present locally] on Brave iOS, but not Safari iOS.
This succeeds when [no such filename conflict present locally]

The download itself is being done, but is shown as failed after completion.

In the reconstruction example I used a download initialized by js.

Steps to reproduce

I did not test against non-OTF (normal) filenames

I think the minimum definition is:

If: [supposed filename is handled on-the-fly, so is not original source/link filename]
then: [Auto-Rename mechanism is not triggered]

The following js download trigger code would currently fail,
if fileName is already present in IOS download dir:

   var link = document.createElement('a');
   link.href = fileUrl;
   link.download = fileName;
   document.body.appendChild(link);
   link.click();
   document.body.removeChild(link);

Actual result

• download finishes
• error "download failed"

Expected result

• download finishes
• renamed if needed (ie: image-1.png, image-2.png)

Reproduces how often

Easily reproduced

Brave version

1.69.2 (172)

Device/iOS version

17.6.1
iPhone Xs

Affected browser versions

• latest AppStore
• latest TestFlight
• previous TestFlight

Reproducibility

• with Brave Shields disabled
• in the latest version of mobile Safari

Miscellaneous information

not an issue in iOS Safari

[Uni-verse]

Verified on iPhone 12 running iOS 18.2 using version 1.75 (175)

• Ensured files are successfully downloaded and renamed when using the download trigger code in download of image (generic file?) fails if identical filename present locally (OTF filenames) #41284 (comment)
• Ensured that downloading the same filename does not cause error.

example	example	example

[Uni-verse]

Verified on iPad (7th Gen) running iOS 18.2.1 using version 1.75 (175)

• Ensured files are successfully downloaded and renamed when using the download trigger code in download of image (generic file?) fails if identical filename present locally (OTF filenames) #41284 (comment)
• Ensured that downloading the same filename does not cause error.

---

example	example	example