More information is available at the community portal. You may ask questions at the help desk, village pump or on IRC channel #wikimedia-commons (webchat). You can also contact an administrator on their talk page. If you have a specific copyright question, ask at the copyright village pump.
Please do not overwrite files
I noticed that you uploaded a file using the name File:PRECIPITATES ARE CONTINUOUSLY MONITORED IN THIS "BAG HOUSE" CONTROL ROOM AT THE UNION CARBIDE FERRO-ALLOY PLANT.... - NARA - 557394.jpg. A file by this name already existed on Commons. Overwriting an existing file should not be done except when making minor, uncontroversial corrections, so the file has been restored to its previous version. If the file that you attempted to upload is within our project scope and is in the public domain or published under a free license, please upload it again under a different name. Thank you.
For more information, please see Commons:Overwriting files.
|File:எருக்கு4.jpg has been listed at Commons:Deletion requests so that the community can discuss whether it should be kept or not. We would appreciate it if you could go to voice your opinion about this at its entry.
If you created this file, please note that the fact that it has been proposed for deletion does not necessarily mean that we do not value your kind contribution. It simply means that one person believes that there is some specific problem with it, such as a copyright issue.