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Aconex doesn't limit the size of files you can upload, send, or transmit, so in theory, you can upload any file size. This applies to zipped and non-zipped files. However, some browsers, as apposed to Aconex itself, do limit the upload file size. See below for more information on browsers limits. Also, if your bandwidth is limited, it can take longer to upload files.
If you’re unable to upload a file to Aconex because of its size, try uploading it with a different browser, or try uploading your file at the end of the day, when fewer users may be trying to access your site's internet connection.