Attachment button to embed attachment not available when commenting

Summary

The attachment button is not available when commenting in the same transition where attachment is uploaded to the issue.

Environment

JIRA 7.0.0-OD-08-005

Steps to Reproduce

1. Edit a screen to have attachment field and comment field
2. Associate the screen with a workflow
3. Transition the issue to the point where it will use the screen
4. Add an attachment and upon commenting the attachment button is not available to be selected

Expected Results

The attachment button is available and can be selected

Actual Results

No attachment button is available

Notes

The attachment button in comments will be available if there are existing attachments in the issue before the transition.

Workaround

1. Add attachment first, then in another screen add comment with embedded attachment.
2. Drag and drop attachments to the comment field (the attachment will be uploaded and embedded into the comment)