A gallery control in Power Apps allows you to display a list of records, and can be configured to sort the records by a specific field, such as category. Additionally, the gallery control has built-in functionality for expanding or hiding a list of subtopics. This can be done by adding a toggle control within the gallery template to show or hide the subtopics based on user interaction. Reference: https://docs.microsoft.com/en-us
/powerapps/maker/canvas-apps/controls/control-gallery

Reference:
https://docs.microsoft.com/en-us/power-virtual-agents/publication-connect-bot-to-web-channels

Explanation:

Box 1: Office 365 Global Administrator
You may think that the Dynamics 365 system administrator would have power to do all the actions needed to manage Dynamics 365, but this is not the case. What's different in Microsoft cloud deployments is that licenses and user accounts are managed in Office 365 by an Office 365 Global Administrator. This role is analogous to a network administrator for an on premises deployment. The Global Administrator is the only role to create new user accounts and assign subscription licenses for Dynamics 365 (and other Office 365 apps such as Skype, Power BI and SharePoint).
Box 2: Dynamics 365 system administrator
The Dynamics 365 system administrator may assign roles and permissions to the Dynamics 365 user within an instance of Dynamics 365. The Dynamics 365 system administrator also controls all the settings in Dynamics 365.
Box 3: Dynamics 365 admin
The Dynamics 365 admin can perform backups and restores.
Reference:
https://docs.microsoft.com/en-us/power-platform/admin/use-service-admin-role-manage-tenant
https://community.dynamics.com/crm/b/govandthecity/posts/understanding-dynamics-365-and-office-365- admin-roles

In order to send a daily email that contains a list of year-to-date (YTD) totals, you would need to use a loop in the Power Automate cloud flow. A loop allows you to repeat a specific set of actions until a certain condition is met. In this case, the loop would be used to iterate through the data for each day, accumulating the totals for the year-to-date (YTD) and then sending the email at the end of the loop with the accumulated totals.
Here are some references from Microsoft that may be helpful in understanding how to use loops in Power Automate:
Microsoft docs: Loops in Power Automate
Microsoft docs: Repeating a flow with a loop
Microsoft docs: Using the do-until loop in Power Automate