Keep pics ready to upload at a convenient place after resizing / editing etc..
Just select 10 pics at desktop and DRAG it to browser where this post Reply / Edit Post page is opened
Wait for images to upload as at top you will see Moving Loading Bars !
Few pics will start to appear at bottom side of post to reply / edit:
Now when your pics are uploaded.
Check as tumbnail appears.
Press on Full Image to post your pic.
You can press any image to appear first or second etc.
Then press Enter to give gaps of 1 Line.
Give 3-4 line gaps by pressing Enter by 4-5 times.
If some image is repeated, just press Delete button^
Now press Save Changes to post reply / edit to change.
or you can see Preview also.
I used to directly upload the file and it was resized by server but the same is not working.
I tried by clearing the cache but still the message shown as "There was a problem in uploading your file".