Pin loaders requirements

All fields are required to upload data.
Errors are shown when no data is missing in fields
Warnings are shown when data seems bad
Upon upload, items are added to the 'Items Added' tab.
In case of error for one item it is clearly shown.
Pin uploader can see the image and all the data for each image he uploaded, recently or in the past (by scrolling down)
Items can be deleted and edited
Image of items can be changed by uploading a new image or indicating a new URL.