Canon EOS 5D Mark IV L-series Zoom Lens Kit Manuel Du Propriétaire

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Changing FTP Server Settings
[Overwrite same file]
When [Overwrite same file] is set to [Disable]
If there is already a file of the same name in the target folder on the 
FTP server, the new file is saved with an extension consisting of an 
underscore and a number (example: IMG_0003_1.JPG).
When you resend images if initial transfer fails
With the setting to overwrite the same name file, if you retransfer the 
images whose retransfer once failed, the existing file may not be 
overwritten in some cases. If this happens, the new file is saved with 
an extension consisting of an underscore, a letter, and a number 
(example: IMG_0003_a1.JPG).
[Passive mode]
Enable this setting in network environments protected by a firewall. If 
an Error 41 occurs (“Cannot connect to FTP server”), setting passive 
mode to [Enable] may enable access to the FTP server.
[Proxy server]
Change the proxy server settings.