Hello Louise Burke,
Yes, this can be done. Here are the steps:
1. Click on the green download arrow next to the attachment
2. Select "Copy Link Address"
3. Paste that address in a new URL bar
4. Take the /download out of that URL string
5. Press enter
This will take you to the location of the actual file. Click on the Actions button and then select"Delete".
If you go back to the Microblog post, the attachment should be gone.
Please let me know if this works for you.
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