[PLT-8662] Fix paste upload issue

[saturninoabril]

Summary

Fix paste upload issue

When image from clipboard is pasted into the post textbox, the filename of the image gets posted to the textbox as well. Not sure if that's expected but maybe worth checking from the PM.
@esethna Could you please help validate? Thanks!

Ticket Link

Jira ticket: PLT-8662

Checklist

• Ran make check-style to check for style errors (required for all pull requests)
• Ran make test to ensure unit and component tests passed

[stephenkiers]

Undoing approval, as it seems it is not complete

[mattermod]

Setup Test Server label detected. Spinmint test server created if build succeeds (checks pass and no conflicts with base branch).

[mattermod]

Spinmint test server created at: https://i-0fe79ab6f3543dfae.spinmint.com

Test Admin Account: Email: [email protected] | Password: user-0

Test User Account: Email: [email protected] | Password: user-1

[saturninoabril]

@stephenkiers Yeah, I'm seeing issue when pasting image but not sure if we support it or a regression. I've tried older version but looks the same behavior. Issues like:

• copying image file from local and pasting to textbox uploads the image but filename is pasted into the textbox as well
• same when I copy image from the web (e.g. google image), the image uploads but the link is also pasted into the textbox

@esethna Could you please test pasting images and let me know what issues that needs to resolve? Thanks!

[esethna]

Looks good, ie image should paste without text being added to the input box