Assuming we are not using the bridging method, when within WiFi range, I would use PB web browser to sign in to my gmail or yahoo email account. It is sad PB does not have a native email client yet...
As mentioned by Fmar, tap on "attachment" on the gmail or yahoo email compose email page and you will be presented with a host of photos residing in the playbook under "camera pictures". Tap on the picture you wish to attach which will bring you back to your email and click sent.
I'm using an app called Files and Folders. It's is one of the best app I purchased on my playbook.
I've configered the app to use Gmail as my default email.
All have to do is navigate to the folder where my photos are (usally in the Camera folder), select the picture I want to send, click the send to button and enter the email address.
It's that simple. Another cool feature of this app is that it has thumb nail preview. So it makes finding the photo a lot easier.
Switch gmail to desktop or html mode (scroll to bottom of list of emails on left side of screen). Mobile is default setting, but you can switch to desktop or html.
Once in desktop or html you attach photos same way as you do on your PC.
Note, once you exit gmail, it reverts to mobile when you relaunch gmail.
I'm using an app called Files and Folders. It's is one of the best app I purchased on my playbook.
I've configered the app to use Gmail as my default email.
All have to do is navigate to the folder where my photos are (usally in the Camera folder), select the picture I want to send, click the send to button and enter the email address.
It's that simple. Another cool feature of this app is that it has thumb nail preview. So it makes finding the photo a lot easier.
Your other question - one of the few places folders work is in the Photos app. Each folder will become an ALBUM. You can view photos by album. Unfortunately, you canNOT email photos from the photo app. Also, when looking to attach a photo to an email the folder structure is ignored (as was noted by someone above). So if you have 746, you have to scroll through the whole load of them to find the one to attach. Unless you go with Files&Folders.