How to edit the subject line on estimate and invoice emails on the mobile app

From the job or estimate details page, click the Send icon.

Then you can delete the existing subject line one of two ways.  You can click at the end of the subject line and press the delete button from your keyboard:

Or you can press into the subject line, hold for a moment and press SELECT ALL.

Then press CUT.

Lastly, type in your new subject line and press the Send icon:

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