Pictures and videos not showing in the gallery
Consider any of the solution mentioned below.
Solution 1
Note: Follow the steps for both Internal and external SD Card

Go to File manager  -&gt; Android -&gt;  Data -&gt; com.android.gallery3d.
Delete the folder (com.android.gallery3d) in both internal and external SD card.
Go to Settings -&gt; Apps / Application manager -&gt; search for Gallery -&gt; open Gallery and tap on Clear Data .
Switch off your phone and wait for few minutes (say 2-3 min) and then switch on and wait for few minutes.

That's it now. All the images and videos would be showing under Gallery.
Solution 2

Go to the respective folders where images/videos are stored.
Go to Settings &gt; Show hidden file and see if there is  a .NOMEDIA file. If there is such file then delete it.
Switch off and switch on the device.

That's it.
Solution 3
If above solutions don't work, then you have to search for apps in Play Store which scans SD Card . SDrescan is good. It's only of 20KB in size. And then scan the memory card using that app.