Posting on behalf of a customer here! Currently slack integrations allow for form submission notifications, with links to any attachments that were included in the form. However, the links are separated with a semicolon “;”, causing multiple links to look almost like one chunk of texts, instead of a separate links.
Understand that CMS tools and blogs are able to use HubL filters to split the texts, but this is currently not available to forms or CRM, especially for the file upload property.
When sharing Hubspot data to non-HS users, having accessible and readable links or the option see separate files is key so that none of the content is missed out on. Would appreciate some level of customisation or segmentation for file uploads 
Status: Idea Submitted
Yes! Thanks for posting this!
Attachments from Hubspot to Asana looks pretty bad as those long URL’s, specially when having multiple:
1. Best option: Either include the attachment (so it is visible in Slack)
2. Have smaller links with a nice devision between them.
3. at least have a nice devision between the links
As a minimum if the attachment itself cannot be passed through to Slack at least include a message such as “User uploaded a file with this message.” so that the user in Slack is aware that something was added by the message sender. Right now the only way to tell is to go to the Inbox in Hubspot.