How to specify attachment metadata

[Techie007L]

How do I send attachment metadata along with an attachment? I have tried the command below, but it fails with an error:
signal-cli.bat -u +1********** send -a "data:image/jpeg;filename=C:\BlueIris\camera.jpg;width=1920;height=1080" -m "Message text" +1**********
Failed to send message: data:image/jpeg;filename=C:\BlueIris\camera.jpg;width=1920;height=1080: data:image\jpeg;filename=C:\BlueIris\camera.jpg;width=1920;height=1080 (The filename, directory name, or volume label syntax is incorrect) (AttachmentInvalidException)

The reason the metadata is needed is because the Android Signal app displays the image incorrectly (as a cropped square) when the image dimensions are not sent along with the message (interestingly, this does not appear to affect the iOS Signal app). But I need to be able to see the whole image! To verify the issue, I have sent images to a signal-cli instance from my phone (which display correctly) and from another signal-cli instance (which display incorrectly). This is what comes back when sent from an Android phone:
{"jsonrpc":"2.0","method":"receive",..."attachments":[{"contentType":"image/jpeg", "filename":null,"id":"E29Z1UvLrOrY217Lmvfu.jpg","size":778547, "width":2048,"height":1158,"caption":null,"uploadTimestamp":1707229754769}]...

And here is what comes back when sent from Signal-CLI:
{"jsonrpc":"2.0","method":"receive",..."attachments":[{"contentType":"image/jpeg", "filename":"camera.jpg","id":"2062722308171024073.jpg","size":219466, "width":null,"height":null,"caption":null,"uploadTimestamp":1707231513596}]...

The first message (sent by Signal Android) displays correctly, showing the entire 16:9 image. But the second message (sent from Signal-CLI) displays incorrectly, cropping a 1:1 square out of the middle of the image. As you can see, the first one includes the image dimension metadata, whereas the second one has "null" instead. I need to be able to specify the image dimensions when sending an attachment with signal-cli so the image appears correctly when received on Android! How do I accomplish this?

[AsamK]

signal-cli doesn't support specifying the width/height yet.

[Techie007L]

Could we get this added then? The argument could be made that the sending client is responsible for checking the incoming attachment(s) to query them for possible metadata (like dimensions) ahead of putting the data on the wire, but I don't mind passing this metadata to the sending client via command arguments/JSON to reduce the amount of extra code needed.

Of course, one could also argue that it's the fault of the receiving client (Signal Android) that the image dimensions are not factored into the message bubble size even though it has obviously decoded the image and would have this information handy from the JPEG decoder. Whoever coded the Signal iOS client got this right while the Signal Android team had an oversight here. Either way, when the image metadata is included on the incoming message, both apps work correctly, and I feel it would be easier to get a correction made here than with the official Signal Android folks.