✨ feat: add support for inline images (#169)

* Update GraphSender.cs

Set missing FileAttachement and AttachementItem properties from Core.Models.Attachment

* Fixed typo in GraphSender.cs

Author: fnuhs

src/FluentEmail.Graph/GraphSender.cs

@@ -130,7 +130,14 @@ private async Task UploadAttachmentUnder3Mb(IFluentEmail email, Message draft, C
         {
             var attachment = new FileAttachment
             {
-                Name = a.Filename, ContentType = a.ContentType, ContentBytes = GetAttachmentBytes(a.Data),
+                Name = a.Filename,
+                ContentType = a.ContentType,
+                ContentBytes = GetAttachmentBytes(a.Data),
+                ContentId = a.ContentId,
+                IsInline = a.IsInline,
+
+                // can never be bigger than 3MB, so it is safe to cast to int
+                Size = (int)a.Data.Length,
             };
 
             await this.graphClient.Users[email.Data.FromAddress.EmailAddress]
@@ -146,7 +153,12 @@ private async Task UploadAttachment3MbOrOver(
         {
             var attachmentItem = new AttachmentItem
             {
-                AttachmentType = AttachmentType.File, Name = attachment.Filename, Size = attachment.Data.Length,
+                AttachmentType = AttachmentType.File,
+                Name = attachment.Filename,
+                Size = attachment.Data.Length,
+                ContentType = attachment.ContentType,
+                ContentId = attachment.ContentId,
+                IsInline = attachment.IsInline,
             };
 
             var uploadSession = await this.graphClient.Users[email.Data.FromAddress.EmailAddress]