There are a few things you can do in Photoshop to open sequences. The first is to click on the Open button at the bottom of the screen. This will open a dialog box with several options. The first option is to choose which sequence you want to open. The second option is to choose how many times you want the sequence to be opened. The third option is to choose how big of a image you want it to be. The fourth option is to choose whether or not you want the sequence displayed in its entirety on the screen or only some of it. Finally, you can choose whether or not you want it saved as a file.