Cannot use a local image with EmbedBuilder

Cross-posted from question on StackOverflow

According to the Discord.Net API Documentation page for the EmbedBuilder class, the syntax to add a local image to an EmbedBuilder object should look something like this (converted to VB):

Dim fileName = "image.png"
Dim embed = New EmbedBuilder() With {
    .ImageUrl = $"attachment://{fileName}"
}.Build()

I’m trying to use something like this to add a dynamically created image to the EmbedBuilder, but I can’t seem to get it to work properly. Here’s basically what I’ve got:

Dim Builder As New Discord.EmbedBuilder
Dim DynamicImagePath As String = CreateDynamicImage()
Dim AttachURI As String = $"attachment:///" & DynamicImagePath.Replace("\", "/").Replace(" ", "%20")

With Builder
    .Description = "SAMPLE DESCRIPTION"
    .ImageUrl = AttachURI
End With

MyClient.GetGuild(ServerID).GetTextChannel(PostChannelID).SendMessageAsync("THIS IS A TEST", False, Builder.Build)

My CreateDynamicImage method returns the full path to the locally created image (e.g., C:\Folder\Another Folder\image.png). I’ve done a fair amount of “fighting”/testing with this to get past the Url must be a well-formed URI exception I was initially getting because of the [SPACE] in the path.

MyClient is a Discord.WebSocket.SocketClient object set elsewhere.

The SendMessageAsync method does send the embed to Discord on the correct channel, but without the embedded image.

If I instead send the image using the SendFileAsync method (like so):

MyClient.GetGuild(ServerID).GetTextChannel(PostChannelID).SendFileAsync(DynamicImagePath, "THIS IS A TEST", False, Builder.Build)

the image is sent to Discord, but as a part of the message rather than included as a part of the embed (NOTE: this behavior is expected for the SendFileAsync method - I only mention it here because this was a part of my testing to ensure that there wasn’t some sort of problem with actually sending the image to Discord).

I’ve tried using the file:/// scheme instead of the attachment:/// scheme, but that results in the entire post never making it to Discord at all.

Additionally, in other parts of my code, I can successfully set the ImageUrl property to a Web resource (e.g., https://www.somesite.com/someimage.png) and the embed looks exactly as expected with the image and everything when it successfully posts to Discord.

---

According to the only answer currently posted to the referenced StackOverflow question, it appears this may something to do with the CDN URL used by Discord.Net. - https://cdn.discordapp.com/attachments instead of the “newer”(?) address of https://media.discordapp.net. Obviously, if this is the case, I could try to rework and recompile the code for this bit, but as I have a fairly extensive amount of work yet to do, I believe this task is better suited to the library’s author for investigation.

In the meantime, since using images that are already available with a Web URL seems to work as expected, I believe I have a solution that involves uploading the image to Imgur (using the Imgur.API NuGet library. Once the image is uploaded there, I should be able to use the generated link to populate the EmbedBuilder’s ImageUrl property. I haven’t had a chance to test this thoroughly yet, but based on my experience so far, I would assume that it should work.

[BobVul]

Just a couple slightly more complete examples:

With filePath overload:

var filename = Path.GetFileName(filePath);

var embed = new EmbedBuilder()
    .WithImageUrl($"attachment://{filename}")
    .Build();

await channel.SendFileAsync(filePath: filePath, embed: embed, text: null);

With stream overload:

using var stream = File.OpenRead(filePath);
var filename = Path.GetFileName(filePath);

var embed = new EmbedBuilder()
    .WithImageUrl($"attachment://{filename}")
    .Build();

await channel.SendFileAsync(stream: stream, filename: filename, embed: embed, text: null);

With stream overload and an unrelated filename:

using var stream = File.OpenRead(filePath);
var filename = "image.png";

var embed = new EmbedBuilder()
    .WithImageUrl($"attachment://{filename}")
    .Build();

await channel.SendFileAsync(stream: stream, filename: filename, embed: embed, text: null);

[Still34]

Looks like this has been solved. Closing.