First, an action must be a row level action for it to appear. A single action is made visible. To see others, tap on the "3 dot" menu next to the displayed action.
The feature you are trying to use does not select a "subset" of rows to be used in a single action. Instead, it is a "Bulk Processing" feature that applies the activated action to EACH row selected. You would not be to accomplish what you are trying to do without some additional implementation.
As I understand it, you want to be able to select multiple rows and then have ALL selected rows appear in a single email. There isn't a concept of "selected rows in AppSheet. For this you would need the ability to mark/indicate a row as "selected".
For example, you could add a column named "Selected" to use as that indicator. Then create an action that triggers the Bot to send the email. The Bot gathers all the rows where "Selected" is populated and applies them to the email in some fashion. You do need to be careful in the event multiple users are performing this activity simultaneously. To counter for that, simply add the user ID in the selected column to indicate WHO selected it. The bot then gathers the rows based on the user. As the last step of the Bot, reset/blank out the "Selected" column. NOTE: you could use the "Bulk Processing" feature explained above as the way to mark the rows selected.
On the other hand, if there is a way to AUTOMATICALLY determine the rows required to be inserted, the preferred way of handling the gathering of rows would be by using a Slice or SELECT() function inside the Email Bot.
I hope this helps!
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