Attach Files to Emails
Learn how to attach files to outgoing emails, including supported file types, size limits, and drag-and-drop uploading.
What this guide covers
This guide explains how to attach files to outgoing emails in the JobsiteOn inbox. You will learn which file types are supported, how to use drag-and-drop uploading, what the size limits are, and how to manage attachments before sending.
By the end you will know how to:
- Attach files using the attachment button or drag-and-drop
- Understand supported file types and size restrictions
- Preview and remove attachments before sending
- Troubleshoot common attachment issues
Before you begin
- Your company email address must be configured. See Set Up Your Company Email Address if you have not done this yet.
- You need inbox access enabled for your account.
Supported file types
JobsiteOn supports the most common business file types:
| Category | Formats |
|---|---|
| Documents | PDF, DOCX, XLSX, CSV, TXT |
| Images | JPG, PNG, GIF, WEBP, SVG |
| Archives | ZIP |
| Presentations | PPTX |
Note: Executable files (.exe, .bat, .sh) and script files are blocked for security reasons. If you need to share these types of files, compress them into a ZIP archive first.
Size limits
Each individual attachment can be up to 25 MB. The total combined size of all attachments on a single email cannot exceed 50 MB. If your files exceed these limits, consider using a file sharing service and including a download link in your email body instead.
Step 1 -- Open the compose area
You can attach files when composing a new email or replying to an existing conversation. Open the compose window by clicking Compose in the inbox sidebar, or scroll to the reply area at the bottom of an open conversation.
Step 2 -- Add files using the attachment button
Click the paperclip icon in the editor toolbar. Your operating system's file picker opens. Navigate to the file you want to attach, select it, and click Open.
You can select multiple files at once by holding Ctrl (Windows) or Command (Mac) while clicking files in the picker.
Screenshot: The compose area with the paperclip attachment button highlighted in the editor toolbar
Step 3 -- Add files using drag-and-drop
Drag one or more files from your desktop or file explorer directly into the compose area. A drop zone indicator appears with a highlighted border when you hover files over the editor. Release to upload the files.
Animation: A user dragging a PDF file from their desktop into the compose area, showing the drop zone highlight and the file appearing as an attachment card
Step 4 -- Preview and manage attachments
After adding attachments, they appear below the message body as file cards. Each card shows:
- The file name
- The file type icon
- The file size
Click the X button on any attachment card to remove it before sending. You can also click an image attachment to preview it inline.
Screenshot: Three attachment cards below the compose area showing a PDF, a JPG image, and a DOCX file with remove buttons
Step 5 -- Send your email
Once your attachments are in place and your message is ready, click Send. The files are included with your email and the recipient can download them from their email client.
Viewing attachments on received emails
When a customer sends you an email with attachments, the files appear on the message in the conversation thread. You can:
- Click to preview images and PDFs inline
- Click Download to save any attachment to your computer
- See the file name, type, and size at a glance
Troubleshooting
My file upload failed
Check that the file does not exceed 25 MB and is a supported file type. If the issue persists, try refreshing the page and uploading again.
The recipient says they cannot open the attachment
Confirm the file is not corrupted by opening it on your own computer first. Some older email clients may have trouble with newer file formats like WEBP. Consider converting to a more universal format like JPG or PDF.
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