You have few ways to finish a project.
Manually sending notification message and files
When all jobs and assignments will be marked as finished, project status will also be changed to Finished, which signals about the need to deliver a project.
You can open such project and click Send an e-mail to selected customer contact button to create a message. File attachments dialog will open, where you can select all files you wish to attach to a message:
If you use automatic uploading to cloud drives, you can select files regardless their size. Otherwise, take a note on the File size column. Click OK, and system will display e-mail composing window. By default, Project delivery message template will be applied, so in ideal case you'll only need to check the text, recipients and files, and click Send to send a message. Otherwise, you can freely change anything in a created message before sending it.
In the result, when you return to a project, its status will be changed to Delivered.
Automatic notification about completed project
If you use customer portal, application can send notifications about completed projects to customers automatically. This happens when project status changes to Delivered. To make this function working, you need to have a message template with Use as default for value set to Project delivery and non-checked Disabled box.
Automatically created message will have attached all project files with type set to "Translated file', 'Proofread file' or 'Deliverable'. If total size of files which were automatically attached exceeds limit set in the application settings, then files won't be attached at all, and customer will receive only text message. Taking this into account, it's always recommended to include link to a project in the message template. Also, if you expect large files to be delivered, you can configure automatic files uploading to a cloud drive. In this case, despite the size of attached files, they will be uploaded to a cloud drive and link will be inserted into a message. However, take a note that corresponding variable should present in a message template.
To know that message was automatically sent and delivered, you can switch to the mail messages tab: