Since releasing Unread 3.3 with Save to Unread I have heard from a few customers who did not initially see Save to Unread or Subscribe in Unread in the share sheet. I imagine others have the same question. Both Save to Unread and Subscribe in Unread appear in the set of actions listed vertically with monochrome icons:

If you use either action frequently, you can add it to your set of Favorites as follows:

1. Tap the Edit Actions button at the very bottom of the share sheet.

2. Find Save to Unread or Subscribe in Unread in the Other Actions section.

3. Tap the green plus (“+”) sign next to the action.

Adding an action to Favorites puts the action closer to the top of the share sheet.