Hi bonny259,
It sounds like recently you're unable to send documents you have scanned into your iPhone using the Notes app until you restart your device and send again. We know how challenging this can be, especially in these times with children working form home on schoolwork and having to communicate and send those files to the appropriate person. You've come to the right place for help.
Do you experience issues when sending files from the built-in Mail app? Are you selecting the Share button on the note then choosing Mail? We're going to include the following resources that will help with troubleshooting either Mail not sending or Notes issues.
Use Notes on your iPhone, iPad, and iPod touch
Share your notes on your iPhone, iPad, iPod touch, or Mac
For help with any mail not sending this link will offer some guidance:
If you can’t send email on your iPhone, iPad, or iPod touch
Should you still experience issues trying to send those notes along, don't hesitate to reach back out to the community with the details to the questions we asked.
Have a great day!