diff --git a/localPackages/BitFoundation/Sources/BitFoundation/FileTransferLimits.swift b/localPackages/BitFoundation/Sources/BitFoundation/FileTransferLimits.swift
index 4c54f79c..aa6b9932 100644
--- a/localPackages/BitFoundation/Sources/BitFoundation/FileTransferLimits.swift
+++ b/localPackages/BitFoundation/Sources/BitFoundation/FileTransferLimits.swift
@@ -7,15 +7,9 @@ public enum FileTransferLimits {
     /// Compressed images after downscaling should comfortably fit under this budget.
     public static let maxImageBytes: Int = 512 * 1024 // 512 KiB
     /// Worst-case size once TLV metadata and binary packet framing are included for the largest payloads.
-    public static let maxFramedFileBytes: Int = {
-        let maxMetadataBytes = Int(UInt16.max) * 2 // fileName + mimeType TLVs
-        let tlvEnvelopeOverhead = 18 + maxMetadataBytes // TLV tags + lengths + metadata bytes
-        let binaryEnvelopeOverhead = BinaryProtocol.v2HeaderSize
-            + BinaryProtocol.senderIDSize
-            + BinaryProtocol.recipientIDSize
-            + BinaryProtocol.signatureSize
-        return maxPayloadBytes + tlvEnvelopeOverhead + binaryEnvelopeOverhead
-    }()
+    /// Note: This is now a hard expanded-size ceiling rather than the old tlv+frame formula.
+    /// MUST stay in sync with AppConstants.Protocol.MAX_PAYLOAD_LENGTH in the Android repo (issue #1618).
+    public static let maxFramedFileBytes: Int = 10_485_760
 
     public static func isValidPayload(_ size: Int) -> Bool {
         size <= maxPayloadBytes
diff --git a/localPackages/BitFoundation/Tests/BitFoundationTests/BinaryProtocolTests.swift b/localPackages/BitFoundation/Tests/BitFoundationTests/BinaryProtocolTests.swift
index ddf7c8fc..b500afc4 100644
--- a/localPackages/BitFoundation/Tests/BitFoundationTests/BinaryProtocolTests.swift
+++ b/localPackages/BitFoundation/Tests/BitFoundationTests/BinaryProtocolTests.swift
@@ -350,6 +350,17 @@ struct BinaryProtocolTests {
         #expect(BinaryProtocol.decode(encoded) == nil)
     }
     
+    @Test("Regression test for issue #1618: decode payload between 1.13 MiB and 10 MiB")
+    func payloadSizeBetweenOldAndNewLimit() throws {
+        let payloadSize = 2_000_000
+        let payload = Data(repeating: 0x41, count: payloadSize)
+        let packet = TestHelpers.createTestPacket(payload: payload, version: 2)
+        
+        let encodedData = try #require(BinaryProtocol.encode(packet), "Failed to encode packet")
+        let decodedPacket = try #require(BinaryProtocol.decode(encodedData), "Failed to decode packet")
+        #expect(decodedPacket.payload == payload)
+    }
+    
     // MARK: - Message Padding Tests
     
     @Test func messagePadding() throws {
diff --git a/localPackages/BitFoundation/Tests/BitFoundationTests/TestHelpers.swift b/localPackages/BitFoundation/Tests/BitFoundationTests/TestHelpers.swift
index 7b2ff6a3..94817a26 100644
--- a/localPackages/BitFoundation/Tests/BitFoundationTests/TestHelpers.swift
+++ b/localPackages/BitFoundation/Tests/BitFoundationTests/TestHelpers.swift
@@ -56,7 +56,8 @@ final class TestHelpers {
         recipientID: PeerID? = nil,
         payload: Data = Data("test payload".utf8),
         signature: Data? = nil,
-        ttl: UInt8 = 3
+        ttl: UInt8 = 3,
+        version: UInt8 = 1
     ) -> BitchatPacket {
         return BitchatPacket(
             type: type,
@@ -65,7 +66,8 @@ final class TestHelpers {
             timestamp: UInt64(Date().timeIntervalSince1970 * 1000),
             payload: payload,
             signature: signature,
-            ttl: ttl
+            ttl: ttl,
+            version: version
         )
     }