[Sentry] Metamask mobile crashes when try to download file

[marcoready]

We are developing a dApp using metamask browser extension and we also want to able to use it on metamask mobile browser.
We need to download files on the client-side.
On the desktop the download of the files are working well:

function createDownloadLink(file: File): void {
     const objectURL = URL.createObjectURL(file);
     const link = document.createElement('a');
     link.setAttribute('href', objectURL);
     link.setAttribute('download', file.name as string);
     document.body.appendChild(link);
     link.click();
     document.body.removeChild(link);
     URL.revokeObjectURL(objectURL);
   }

BUT in Metamask mobile just crashes and exits when we click on the download.

We also to refactor to use FileReader instead of URL API (https://developer.mozilla.org/pt-BR/docs/Web/API/FileReader/FileReader) but it still crashes.

Other approaches that we tried was https://www.npmjs.com/package/file-saver and https://github.com/jimmywarting/StreamSaver.js

The stream saver works fine in chrome mobile browser, but not in the metamask mobile browser
Here's there an example
https://jimmywarting.github.io/StreamSaver.js/examples/saving-a-blob.html

[marcoready]

Forgot to mention that I'm using metamask mobile android version v.1.0.10 (44)

[Lambdac0re]

Yes some dApps just start a file download and crash the browser... Unusable.

[socathie]

In the dapp I'm building, I also need a download function (I'm simply using <a href="..." download="...">) so that the user can save a copy of the data. Seems like metamask mobile browser has disabled functions related to download.

Is there a particular reason why metamask wouldn't allow user to right click on download something? That's quite annoying.

[slavco86]

Same here - been trying all kinds of things. Either app crashes or open up a tab with giberish.
User needs to be able to download a PDF from the dapp and is unable to do so in MM browser.
@gantunesr Can/when will this be looked at, please?

[oceanByte]

MetaMask Mobile still does not support downloading files. Does someone know why this feature is disabled for MetaMask Mobile? Allowing a user to download a file seems like a common use case that should be supported.

[gantunesr]

Hi @slavco86 and @oceanByte, let me take a look at this issue and update it accordingly. Can you send me one of your dapps to test it?

[slavco86]

@gantunesr
We had to descope the downloading feature because of this issue, so the current dapp hasn't got that bit to test.
But it's literally as simple as trying to render a link with download attribute set which points to some file that a user is meant to download.
Try that and see what happens
https://www.w3schools.com/tags/att_a_download.asp