The same Cirrus Insight Sidebar that you use in Gmail desktop/web can also be accessed from the Gmail mobile app.
1. Navigate to the Gmail mobile app (for Android or iOS).
2. Go to Settings > Add-ons and then tap the + sign next to Cirrus Insight.
If successful, jump to step 6. Otherwise, proceed to step 3.
3. If you do not see Cirrus Insight listed as an add-in, return to Settings and confirm your Mail account is the correct email address that you use with Cirrus Insight.
4. After confirming the email address, tap your mail account and select Reset Account and Continue.
5. If the issue persists, follow the steps in How do I install Cirrus Insight for Gmail? and repeat steps 1-2.
6. Open an email.
7. Tap the email's "..." menu and select (Cirrus Insight) from the bottom add-ons ribbon.
For a full mobile walkthrough on Gmail, watch this video.
Updated Oct. 2021