The uploader avoids adding another selected file when a file with the same name and size is already in Files to upload. This prevents a repeated selection or drag from duplicating the same item in the current batch.
Review the list before selecting again. If the file is already there, you can proceed after checking its contents and company context. A double click on the file picker should not require two copies in the batch.
If two genuinely different files happen to have the same name and size, rename one clearly before selecting it so the batch can distinguish them. Do not assume the uploader compared every page or verified that the documents are identical.
This selection rule is separate from historical document review. A file may already exist in the library from an earlier upload even if the current selection accepts it. Search the library when you are unsure about prior receipt, and avoid resending an entire batch after a partial success. Confirm the final upload count against your intended file list.
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