Yes, that's correct.

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Though just note that >0HS selects the files modified (not created) in the current hour (not sure how define the last hour).
See https://winscp.net/eng/docs/file_mask#today

This will cause the file to upload only if created in the last hour:

This will cause the file to upload only if it contains data:

This seems to upload the file if it was modified in the last hour OR if it contains data:

What do I need to do differently so the file will only upload if it satisfies both conditions instead of either?

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Edit: Looks like this is what I needed to use: