The phrase "are appended with" is correct and usable in written English.
It can be used when describing the addition of something to another item, often in a technical or formal context.
Example: "The data files are appended with additional metadata to enhance their usability."
Alternatives: "are added with" or "are supplemented with".
Most of the videos are appended with searchable transcripts a fun tool for those interested in lexical tics.
Then, MFCCs are appended with the velocity and acceleration coefficients.
The usual 5 degrees of freedom per node are appended with an additional drilling degree of freedom in order to fit the transformation.
It does this using 'drag-and-link'; a simple feature by which text extracts copied from source locations are appended with hyperlinks to force the re-display of the source.
Company names below that are appended with * denote partnerships that Facebook says it is "still in the process of ending" (it notes three exceptions: Tobii, Apple and Amazon, which it says will continue beyond October 2018), while ** denotes data partnerships that will continue but without access to friends' data.
Sometimes the vocal tics are appended with physical motions, like this one where I do my hands like I'm playing a blastbeat on the snare and shrieking at the same time, though no actual sound comes out.
The revenge fantasy "I Wanna Be Around" was appended with a ferociously growled "yeah".
In the US midwest, admittedly, the word "city" has been appended with abandon to any one-brothel main street that once offered relief to travellers across the prairies.
Appalachian mountain music gave way to the blues, and one song was appended with a fragment from a Bach cello suite, beautifully played.
The trending term "Case of the Anhui girl who fell to her death" was appended with a notice that the police have said her death was not a homicide.
