diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/model/Account.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/model/Account.kt
index ebd30cb2a..a5b2995d4 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/model/Account.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/model/Account.kt
@@ -1508,12 +1508,13 @@ class Account(
 
     fun createBlossomUploadAuth(
         hash: HexKey,
+        size: Long,
         alt: String,
         onReady: (BlossomAuthorizationEvent) -> Unit,
     ) {
         if (!isWriteable()) return
 
-        BlossomAuthorizationEvent.createUploadAuth(hash, alt, signer, onReady = onReady)
+        BlossomAuthorizationEvent.createUploadAuth(hash, size, alt, signer, onReady = onReady)
     }
 
     fun createBlossomDeleteAuth(
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/BlossomUploader.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/BlossomUploader.kt
index ac1430b26..215f029f4 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/BlossomUploader.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/BlossomUploader.kt
@@ -123,7 +123,7 @@ class BlossomUploader(
     ): MediaUploadResult {
         checkNotInMainThread()
 
-        val fileName = randomChars()
+        val fileName = fileName ?: randomChars()
         val extension =
             contentType?.let { MimeTypeMap.getSingleton().getExtensionFromMimeType(it) } ?: ""
 
@@ -145,6 +145,7 @@ class BlossomUploader(
 
         authUploadHeader(
             hash,
+            length.toLong(),
             alt?.let { "Uploading $it" } ?: "Uploading $fileName",
         )?.let {
             requestBuilder.addHeader("Authorization", it)
@@ -226,11 +227,12 @@ class BlossomUploader(
 
     suspend fun authUploadHeader(
         hash: String,
+        size: Long,
         alt: String,
     ): String? {
         val myAccount = account ?: return null
         return tryAndWait { continuation ->
-            myAccount.createBlossomUploadAuth(hash, alt) {
+            myAccount.createBlossomUploadAuth(hash, size, alt) {
                 val encodedNIP98Event = Base64.getEncoder().encodeToString(it.toJson().toByteArray())
                 continuation.resume("Nostr $encodedNIP98Event")
             }
diff --git a/quartz/src/main/java/com/vitorpamplona/quartz/events/BlossomAuthorizationEvent.kt b/quartz/src/main/java/com/vitorpamplona/quartz/events/BlossomAuthorizationEvent.kt
index b05f88da6..9b8d9aa1b 100644
--- a/quartz/src/main/java/com/vitorpamplona/quartz/events/BlossomAuthorizationEvent.kt
+++ b/quartz/src/main/java/com/vitorpamplona/quartz/events/BlossomAuthorizationEvent.kt
@@ -43,14 +43,14 @@ class BlossomAuthorizationEvent(
             signer: NostrSigner,
             createdAt: Long = TimeUtils.now(),
             onReady: (BlossomAuthorizationEvent) -> Unit,
-        ) = createAuth("get", hash, alt, signer, createdAt, onReady)
+        ) = createAuth("get", hash, null, alt, signer, createdAt, onReady)
 
         fun createListAuth(
             signer: NostrSigner,
             alt: String,
             createdAt: Long = TimeUtils.now(),
             onReady: (BlossomAuthorizationEvent) -> Unit,
-        ) = createAuth("list", null, alt, signer, createdAt, onReady)
+        ) = createAuth("list", null, null, alt, signer, createdAt, onReady)
 
         fun createDeleteAuth(
             hash: HexKey,
@@ -58,19 +58,21 @@ class BlossomAuthorizationEvent(
             signer: NostrSigner,
             createdAt: Long = TimeUtils.now(),
             onReady: (BlossomAuthorizationEvent) -> Unit,
-        ) = createAuth("delete", hash, alt, signer, createdAt, onReady)
+        ) = createAuth("delete", hash, null, alt, signer, createdAt, onReady)
 
         fun createUploadAuth(
             hash: HexKey,
+            size: Long,
             alt: String,
             signer: NostrSigner,
             createdAt: Long = TimeUtils.now(),
             onReady: (BlossomAuthorizationEvent) -> Unit,
-        ) = createAuth("upload", hash, alt, signer, createdAt, onReady)
+        ) = createAuth("upload", hash, size, alt, signer, createdAt, onReady)
 
         private fun createAuth(
             type: String,
             hash: HexKey?,
+            fileSize: Long?,
             alt: String,
             signer: NostrSigner,
             createdAt: Long = TimeUtils.now(),
@@ -80,6 +82,7 @@ class BlossomAuthorizationEvent(
                 listOfNotNull(
                     arrayOf("t", type),
                     arrayOf("expiration", TimeUtils.oneHourAhead().toString()),
+                    fileSize?.let { arrayOf("size", it.toString()) },
                     hash?.let { arrayOf("x", it) },
                 )