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I'm sorry but there is no "select all" function built into the Album applicaiton.
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If you want to manage photos by moving them to another folder in memory, you can use a file manager like ES File Explorer to explore and make changes to the picture and any other file saved in your device. And it has a select all button in case you have a big collection of photos.. 
It doesn't mater where you move the pictures in memory, the album app displays them as if the wore in a centralised location...