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Attach files to a message, check your size limits, and open or save the files you receive.
Attachments are encrypted along with the message they belong to.
Attach a file
- In the composer, click Attach file (the paperclip), or drag files onto the message window.
- Wait for each file to finish uploading before you send.
Each file appears in the message. To remove one before you send, click Remove attachment on it.
Size and count limits
One message can carry up to 50 attachments. Your plan sets the total size of all attachments in one message:
| Plan | Attachments per message |
|---|---|
| Free | 25 MB |
| Star | 50 MB |
| Nova, Duo | 100 MB |
| Supernova, Family | 250 MB |
In Aster Mail on the web and in the desktop app, one message can carry at most 64 MB of attachments, whatever your plan.
If a file takes the message over your limit, Aster tells you before it uploads the file. If you try to send a message that’s over a limit, Aster explains what to change, and your draft stays saved.
Many other mail servers refuse large messages even when Aster can send them. If a recipient says a large message never arrived, send the files in smaller groups across several messages.
Scheduled messages
Scheduled messages can’t include attachments yet. To send files, send the message now, or remove the files before you schedule it.
Send a larger file
For a file over the limit, upload it to storage you control and send a link instead. If the file is sensitive, put the link in a password-protected message and share the password another way.
Open what you receive
To preview an image or a PDF, click it in the message. The preview has a Download button. To open any other file type, click the download button on the file, and then open it with an app on your device. Downloaded files are decrypted, so store them somewhere you trust.
Stay safe with attachments
Encryption doesn’t make an unsafe file safe. Before you open a file, check that:
- You expected it. An invoice or delivery notice you weren’t waiting for is a common way to spread malware.
- The sender is who they claim to be. Check the full address, not only the display name.
- The file type makes sense. A document that arrives as a program, a script, or a shortcut is a warning sign.
If a message looks suspicious, don’t open the attachment. Report it instead.
Troubleshooting
If a file doesn’t upload, Aster shows “This attachment did not upload. Try again. Your draft is saved.” To fix it:
- Check your internet connection.
- Remove the file, and then add it again.
- Close the file in any other app that has it open.
- If the file is close to your limit, send it in its own message.
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