Mail Merge for Gmail How Simple on Google Workspace Marketplace
A pop-up will ask for your authorization to install the add-on, click on Continue
Another popup will ask you for some permissions, click on "Allow"
After the installation (it usually takes less than 15 seconds) you will get a popup, saying that the add-on has been installed.
The next step is to open the add-on and let the magic happen.
Launch Mail Merge for Gmail
Launch Mail Merge for Gmail Add-on from Google Sheets
Open Google Sheets (if Google Sheets was already opened, refresh the page)
Add-ons take around 15s to load after you opened Google Sheets.
Go to Extensions / Mail Merge For Gmail / Start ... there you go!
There are two known issues that we can't fix, as it doesn't depend on Mail Merge for Gmail:
1- The add-on doesn't seem to be installed successfully / I never get the "add-on installed successfully" popup:
This issue can occur when you sign in to Google accounts, and you are not using the principal account for installation. An easy workaround is to open a private window, sign in to the Google account you want, and then proceed to the installation.
2- After successful installation, Merge for Gmail is not visible in Google Sheets:
Simply refresh Google Sheets, wait for 10 seconds, and it should appear in the menu!