Whenever a bug is reported, the attachments of screenshots, videos, logs, user data or any other extra files are uploaded separately in different sequential requests.
Sometimes they aren't uploaded successfully if the file size is too large, the internet connection is weak, or if the user closes the app right away. However, you don't need to worry; once the user launches the app again while connected to the internet, the attachments will be sent right away.
When receiving a bug on the dashboard, the back end will wait for a few minutes for the attachments to arrive before displaying the bug. In some cases, the attachments will arrive later than than the bug by several minutes, causing the bug to appear first. The attachments will automatically be added once they are received.