diff --git a/deltachat-jsonrpc/src/api.rs b/deltachat-jsonrpc/src/api.rs
index fae0196fa..c777763a0 100644
--- a/deltachat-jsonrpc/src/api.rs
+++ b/deltachat-jsonrpc/src/api.rs
@@ -1,5 +1,5 @@
 use std::collections::BTreeMap;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 use std::str;
 use std::sync::Arc;
 use std::time::Duration;
@@ -7,6 +7,7 @@ use std::{collections::HashMap, str::FromStr};
 
 use anyhow::{anyhow, bail, ensure, Context, Result};
 pub use deltachat::accounts::Accounts;
+use deltachat::blob::BlobObject;
 use deltachat::chat::{
     self, add_contact_to_chat, forward_msgs, get_chat_media, get_chat_msgs, get_chat_msgs_ex,
     marknoticed_chat, remove_contact_from_chat, Chat, ChatId, ChatItem, MessageListOptions,
@@ -341,11 +342,19 @@ impl CommandApi {
         ctx.get_info().await
     }
 
+    /// Get the blob dir.
     async fn get_blob_dir(&self, account_id: u32) -> Result<Option<String>> {
         let ctx = self.get_context(account_id).await?;
         Ok(ctx.get_blobdir().to_str().map(|s| s.to_owned()))
     }
 
+    /// Copy file to blobdir.
+    async fn copy_to_blobdir(&self, account_id: u32, path: String) -> Result<PathBuf> {
+        let ctx = self.get_context(account_id).await?;
+        let file = Path::new(&path);
+        Ok(BlobObject::create_and_deduplicate(&ctx, file, file)?.to_abs_path())
+    }
+
     async fn draft_self_report(&self, account_id: u32) -> Result<u32> {
         let ctx = self.get_context(account_id).await?;
         Ok(ctx.draft_self_report().await?.to_u32())
diff --git a/src/blob.rs b/src/blob.rs
index 6b3ec5846..f2622420a 100644
--- a/src/blob.rs
+++ b/src/blob.rs
@@ -193,6 +193,7 @@ impl<'a> BlobObject<'a> {
     /// Note that this is NOT the user-visible filename,
     /// which is only stored in Param::Filename on the message.
     ///
+    #[allow(rustdoc::private_intra_doc_links)]
     /// [Params]: crate::param::Params
     pub fn as_name(&self) -> &str {
         &self.name
@@ -251,6 +252,7 @@ impl<'a> BlobObject<'a> {
         Ok(blob.as_name().to_string())
     }
 
+    /// Recode image to avatar size.
     pub async fn recode_to_avatar_size(&mut self, context: &Context) -> Result<()> {
         let (img_wh, max_bytes) =
             match MediaQuality::from_i32(context.get_config_int(Config::MediaQuality).await?)
diff --git a/src/lib.rs b/src/lib.rs
index f63a20baa..803bb8fe1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -52,7 +52,7 @@ pub(crate) mod events;
 pub use events::*;
 
 mod aheader;
-mod blob;
+pub mod blob;
 pub mod chat;
 pub mod chatlist;
 pub mod config;