diff --git a/deltachat-jsonrpc/src/api.rs b/deltachat-jsonrpc/src/api.rs
index 5c34a554c9..fde2b5cae1 100644
--- a/deltachat-jsonrpc/src/api.rs
+++ b/deltachat-jsonrpc/src/api.rs
@@ -1944,7 +1944,7 @@ impl CommandApi {
         let ctx = self.get_context(account_id).await?;
 
         let mut msg = Message::new(Viewtype::Sticker);
-        msg.set_file(&sticker_path, None);
+        msg.set_file_and_deduplicate(&ctx, Path::new(&sticker_path), None, None)?;
 
         // JSON-rpc does not need heuristics to turn [Viewtype::Sticker] into [Viewtype::Image]
         msg.force_sticker();
@@ -2164,12 +2164,14 @@ impl CommandApi {
 
     // mimics the old desktop call, will get replaced with something better in the composer rewrite,
     // the better version will just be sending the current draft, though there will be probably something similar with more options to this for the corner cases like setting a marker on the map
+    #[expect(clippy::too_many_arguments)]
     async fn misc_send_msg(
         &self,
         account_id: u32,
         chat_id: u32,
         text: Option<String>,
         file: Option<String>,
+        filename: Option<String>,
         location: Option<(f64, f64)>,
         quoted_message_id: Option<u32>,
     ) -> Result<(u32, MessageObject)> {
@@ -2181,7 +2183,7 @@ impl CommandApi {
         });
         message.set_text(text.unwrap_or_default());
         if let Some(file) = file {
-            message.set_file(file, None);
+            message.set_file_and_deduplicate(&ctx, Path::new(&file), filename.as_deref(), None)?;
         }
         if let Some((latitude, longitude)) = location {
             message.set_location(latitude, longitude);
@@ -2209,12 +2211,14 @@ impl CommandApi {
     // the better version should support:
     // - changing viewtype to enable/disable compression
     // - keeping same message id as long as attachment does not change for webxdc messages
+    #[expect(clippy::too_many_arguments)]
     async fn misc_set_draft(
         &self,
         account_id: u32,
         chat_id: u32,
         text: Option<String>,
         file: Option<String>,
+        filename: Option<String>,
         quoted_message_id: Option<u32>,
         view_type: Option<MessageViewtype>,
     ) -> Result<()> {
@@ -2231,7 +2235,7 @@ impl CommandApi {
         ));
         draft.set_text(text.unwrap_or_default());
         if let Some(file) = file {
-            draft.set_file(file, None);
+            draft.set_file_and_deduplicate(&ctx, Path::new(&file), filename.as_deref(), None)?;
         }
         if let Some(id) = quoted_message_id {
             draft
diff --git a/deltachat-jsonrpc/src/api/types/message.rs b/deltachat-jsonrpc/src/api/types/message.rs
index efe7b66ca6..f26a948d89 100644
--- a/deltachat-jsonrpc/src/api/types/message.rs
+++ b/deltachat-jsonrpc/src/api/types/message.rs
@@ -1,3 +1,5 @@
+use std::path::Path;
+
 use crate::api::VcardContact;
 use anyhow::{Context as _, Result};
 use deltachat::chat::Chat;
@@ -593,6 +595,7 @@ pub struct MessageData {
     pub html: Option<String>,
     pub viewtype: Option<MessageViewtype>,
     pub file: Option<String>,
+    pub filename: Option<String>,
     pub location: Option<(f64, f64)>,
     pub override_sender_name: Option<String>,
     /// Quoted message id. Takes preference over `quoted_text` (see below).
@@ -617,7 +620,12 @@ impl MessageData {
             message.set_override_sender_name(self.override_sender_name);
         }
         if let Some(file) = self.file {
-            message.set_file(file, None);
+            message.set_file_and_deduplicate(
+                context,
+                Path::new(&file),
+                self.filename.as_deref(),
+                None,
+            )?;
         }
         if let Some((latitude, longitude)) = self.location {
             message.set_location(latitude, longitude);
diff --git a/deltachat-rpc-client/src/deltachat_rpc_client/chat.py b/deltachat-rpc-client/src/deltachat_rpc_client/chat.py
index 9d33a5a0f4..3522e88992 100644
--- a/deltachat-rpc-client/src/deltachat_rpc_client/chat.py
+++ b/deltachat-rpc-client/src/deltachat_rpc_client/chat.py
@@ -124,6 +124,7 @@ def send_message(
         html: Optional[str] = None,
         viewtype: Optional[ViewType] = None,
         file: Optional[str] = None,
+        filename: Optional[str] = None,
         location: Optional[tuple[float, float]] = None,
         override_sender_name: Optional[str] = None,
         quoted_msg: Optional[Union[int, Message]] = None,
@@ -137,6 +138,7 @@ def send_message(
             "html": html,
             "viewtype": viewtype,
             "file": file,
+            "filename": filename,
             "location": location,
             "overrideSenderName": override_sender_name,
             "quotedMessageId": quoted_msg,
@@ -172,13 +174,14 @@ def set_draft(
         self,
         text: Optional[str] = None,
         file: Optional[str] = None,
+        filename: Optional[str] = None,
         quoted_msg: Optional[int] = None,
         viewtype: Optional[str] = None,
     ) -> None:
         """Set draft message."""
         if isinstance(quoted_msg, Message):
             quoted_msg = quoted_msg.id
-        self._rpc.misc_set_draft(self.account.id, self.id, text, file, quoted_msg, viewtype)
+        self._rpc.misc_set_draft(self.account.id, self.id, text, file, filename, quoted_msg, viewtype)
 
     def remove_draft(self) -> None:
         """Remove draft message."""