Currently it is not possible to obtain the value of a binary column and paste it into another binary column.
This is used for example when copying the rowversion data type for a changelog.
Also, the display of binary data types in a text box is not supported. Some alphanumeric characters are shown but don't look like binary or hex.
Please add support for this.
There is now support for varbinary data types in PowerApps, but not yet in Flow
Please support this idea in Flow