Starting in version 0.9.1, you can create galleries based on photo tags (keywords). When using this option, it will display any photos with the selected tags in that gallery from your entire system. To get to this option, after you create a page / gallery, go to the photos section.
Click the Photos By Tags tab to select the tags to use in the gallery.
Tagging Your Photos
If you tag / keyword your photos before uploading, Sytist will read those tags and save them in the system IF the EXIF extension is enabled in the PHP configuration on your server. You can check by going to Settings -> Photo Settings and it will show you at the bottom right of the page.
You can also tag photos after they are uploaded by either checking the check boxes under the thumbnail and enter the tags in the tray, or by clicking individual photos to add / remove tags.
When using this feature, you can just upload the photos to your all photos section. You can also upload photos to the gallery itself.
Note by using Photos by Tags, it disables the ability to create sub galleries within that gallery.