Copy/paste images on create issue dialog allows to create the issue without the attachment

Issue Summary

On create issue dialog when pasting screenshot (or file) from clipboard to description field only text that refers to the image is inserted but no actual file is attached to issue.

Steps to Reproduce

1. Click to create an issue
2. Paste attachments from the clipboard
3. It displays that the image has been attached and Jira doesn't block the ticket creation when the upload in progress
4. The issue is created and the description shows the error Failed to load where the files couldn't be attached

Video: Screen Recording 2021-10-12 at 01.44.02 PM.mp4

Expected Results

It should upload the attachments and block the issue creation while the upload progress doesn't finish, then display it on the description as a thumbnail.

Actual Results

It doesn't upload the attachments and the description shows that it can't render the image.

Checking the new issue view, we can see the thumbnail and the message:  Failed to load - example with one attached image and one error

By clicking on the image:

Something went wrong.
We couldn't generate a preview for this file.
The selected item was not found on the list.

By checking on the old issue view: example with one attached image and one error

Unable to render embedded object: File (xxxxx.png) not found.

Workaround

Upload the attachment by using the browse option at upload section at issue creation. This way, Jira does not allow you to create the ticket if the attachment hasn't been uploaded.

Suggested Solutions

Jira should upload the attachments and block the issue creation while the upload progress doesn't finish and display it on the description as a thumbnail.