Yes. You can change the caption, the date and two of the options of a scheduled Reel until Storrito starts posting it. The video itself stays as you scheduled it.
Step 1: Open the Schedule page and hover over the Reel you want to change.
Step 2: Click Edit. The Reel opens with its caption, options and date filled in. A note under the account name tells you that you are editing the scheduled Reel.
Step 3: Change what you need:
Step 4: Click Update scheduled Reel.
Storrito updates the Reel you opened and does not create a second one. The Schedule page then shows the new caption and time.
To change one of these, cancel the Reel and schedule it again.
You can edit a Reel as long as its scheduled time is in the future and Storrito has not started posting it. A Reel that is being posted, has failed or is already live can't be edited.
For a Reel that is being posted or has failed, Edit opens the form for a new Reel with the old caption filled in. Anything you save there is scheduled as a second Reel. A Reel that is already live has no Edit button.
Hover over the Reel on the Schedule page and click Cancel:

When you schedule, the Instagram Reel options card holds the cover photo upload, Recommend on Facebook, Show Reel in Instagram posts, and the AI-generated content label. The caption comes from the Caption / description field above the card. See How To Schedule Instagram Stories And Reels.
Tagging people and adding music are not supported for Reels in Storrito.