@SoniaTorres I still would recommend to only use PowerAutomate. Use a Trigger of type "When an item is created or modified"
When do you consider its complete? Because this will be required to be placed in the Trigger Condition Section.
Ofcourse you could use a Button and Call a flow. In that Case you need to pass a Parameter (The Item ID) to your flow.
Therefore you need to use the "Get Item" Action instead "Get Items". In "Get Item" you will be asked to provide a ID. Click in that field and in your dynamic content pane Look for "Ask in powerapps.
In Powerapps you need to slightly change the your flow.Run() function. It should Look similiar to
Yourflowname.Run(SharePointIntegration.SelectedId)
Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item. If the content was useful in other ways, please consider giving it Thumbs Up.