Yes, when sending an email message through Enudge you can attach one file.  

The following file types are supported:

Please note that the attachment can be no larger than 1Mb in size.

To add an attachment:

4. Click on Choose file. Search for and select the file from your computer.

5. Click on SAVE CHANGES.

Please note, whilst you can have attachments for your Enudge email campaigns, we recommend that instead you hyperlink out to your file stored on a web server. This will improve the deliverability of your emails into your contacts' inbox, and also the speed of delivery.

So, only use the attachment feature if it is impossible for you to provide your file via a website.