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When a file is in pre-translation, the localization process will occur wherein a translatable source file is created and uploaded. Once the translatable source file is uploaded, a new document is created under the Documents tab and the file that is associated with it in the Pre-translation tab will be attached as a reference file, and then the document will go through your regular translation process.
Note: The file for translation will appear in the Documents tab in a supported file type format (txt, docx, etc.). Once translation is completed, post translation in the form of DTP, etc., will be needed to convert the file type back to its original form.