The phrase "allowing users to attach" is correct and usable in written English.
You can use it when describing a feature or functionality that enables users to add or include something, such as files or documents, in a system or application.
Example: "The new software update includes a feature allowing users to attach multiple files to their messages."
Alternatives: "enabling users to add" or "permitting users to include".
A specific concern is to allow enriching trajectories with semantic annotations allowing users to attach semantic data to specific parts of the trajectory.
It is also integrated with Salesforce's CRM application, allowing users to attach documents to the CRM records they already have.
Currently, Outlook's biggest selling point is that it makes it easier to be productive in email while on the go, by allowing users to attach and view files from online file storage services, like OneDrive and Dropbox; access all their contacts, calendars and attachments from one interface; check their availability and book meetings on the fly; and more.
One company hoping to benefit is Signature-mail.com, based in Greenwich, Conn., which allows users to attach a picture of their actual signature to e-mail.
Last fall, Facebook launched a new photo application, which allows users to attach to their profile as many digital pictures as they want.
Run by Sina, another leading internet firm, it is often billed as the "Twitter of China", but it allows users to attach comments, pictures and even videos to their messages.
And new Zendesk app will allow users to attach a Zendesk customer service ticket to a Yammer message.
In addition, a molded exterior ring allows users to attach a carabiner, cable, or nylon strap for more convenient accessibility.
For example, expanding this app to allow users to attach custom graphics to their custom actions would create a new, rare class of virtual objects.
It also allows users to attach audio and video files to pins to provide more context around the experiences, tied to specific places.
The new version allows users to attach documents from a hard drive or server, and send emails updates about any changes made to a document.
