Hopefully, you will see the words '0 errors, 0 warnings' at the bottom.
Now, finally, we shall rotate any pics that are on their sides.
Open the batch tool as before, browse to the 'for web' folder but instead of clicking 'add all' click on each picture, and if it is on its side(you can see in the preview box), click the 'add' button.
When you have all the pics you want to rotate selected, Click the 'Advanced options' button;
Make sure the only boxes ticked are the 'Rotate (right or left), and the 'Overwrite existing'. Click OK, and now set the quality, using the options button, at 100%.
Make sure the 'output directory' is still this same 'for web' folder. Click on Start, and it's done.
Your pictures are now ready to upload to the gallery.