It might not help because it's in svelte and it doesn't look like you're using lemmy-js-client, but this is an example of how I do it in Alexandrite using lemmy-js-client. The onPaste function handles the paste event on the markdown editor textarea when someone pastes with an image in their clipboard, and the onFileInputChange is the change event for an <input type="file" /> element so when someone selects a file it uploads and the input's label can be styled like a button. Here is the client's fetch function which handles the authorization header and whatnot. You can upload client-side without a proxy server for any instance running a newer version of Lemmy than like.... 0.19.0? I didn't want to be responsible for proxying image uploads so I waited to add image uploading in Alexandrite until I could do the uploads directly client side.
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i cant install lemmy-js-client because i have js. not node.js. i already tried some CDN and ESM libraries but it needs exports from node.js. i also tried to create some sort of lemmy-js-proxy (server with lemmy-js-client) which i would fetch through my site with the js but... JS CANT FETCH IT BECAUSE 404! i dont know why...