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I suggest something more on the line of 'Up to a cloud/other device' or 'Down from the cloud/other device' as that terminology similar to generally accepted as information being sent or received by a device. 'Send to xxx' or 'Receive from xxx' [or just 'Send', 'Receive'] would also be more understandable to me.

The Two Way Sync popup is confusing also. It could use some explanation like 'Select which to keep' and 'Keep Both' for those you're not sure of, and 'Skip = don't sync?'. The 'Keep Both' should have a marker added to the displayed name [symbol in front] to aid in identifying those charts that may need more editing [or sync verification?] in the case of large numbers of charts [more than 1?  ] with changes.

In a number of cases when I did a 2 way sync, the popup displayed a chart in one column only, either client or server. I think I used the default settings.