diff --git a/libretroshare/src/retroshare/rsfiles.h b/libretroshare/src/retroshare/rsfiles.h
index a4a8bfea2..4fca503a7 100644
--- a/libretroshare/src/retroshare/rsfiles.h
+++ b/libretroshare/src/retroshare/rsfiles.h
@@ -213,11 +213,14 @@ public:
 	virtual bool getFileData( const RsFileHash& hash, uint64_t offset,
 	                          uint32_t& requested_size, uint8_t* data ) = 0;
 
-		/***
-		 *  Control of Downloads.
-		 ***/
-
-		virtual bool alreadyHaveFile(const RsFileHash& hash, FileInfo &info) = 0;
+	/**
+	 * @brief Check if we already have a file
+	 * @jsonapi{development}
+	 * @param[in] hash file identifier
+	 * @param[out] info storage for the possibly found file information
+	 * @return true if the file is already present, false otherwise
+	 */
+	virtual bool alreadyHaveFile(const RsFileHash& hash, FileInfo &info) = 0;
 
 	/**
 	 * @brief Initiate downloading of a file
diff --git a/libretroshare/src/retroshare/rsgxschannels.h b/libretroshare/src/retroshare/rsgxschannels.h
index 75a5edab4..383ebc7df 100644
--- a/libretroshare/src/retroshare/rsgxschannels.h
+++ b/libretroshare/src/retroshare/rsgxschannels.h
@@ -56,7 +56,7 @@ struct RsGxsChannelGroup : RsSerializable
 	{
 		RS_SERIAL_PROCESS(mMeta);
 		RS_SERIAL_PROCESS(mDescription);
-		//RS_SERIAL_PROCESS(mImage);
+		RS_SERIAL_PROCESS(mImage);
 		RS_SERIAL_PROCESS(mAutoDownload);
 	}
 };
@@ -90,7 +90,7 @@ struct RsGxsChannelPost : RsSerializable
 		RS_SERIAL_PROCESS(mFiles);
 		RS_SERIAL_PROCESS(mCount);
 		RS_SERIAL_PROCESS(mSize);
-		//RS_SERIAL_PROCESS(mThumbnail);
+		RS_SERIAL_PROCESS(mThumbnail);
 	}
 };
 
diff --git a/libretroshare/src/retroshare/rsgxscommon.h b/libretroshare/src/retroshare/rsgxscommon.h
index 0ecd933f0..57b17ed35 100644
--- a/libretroshare/src/retroshare/rsgxscommon.h
+++ b/libretroshare/src/retroshare/rsgxscommon.h
@@ -50,7 +50,7 @@ struct RsGxsFile : RsSerializable
 	}
 };
 
-struct RsGxsImage
+struct RsGxsImage  : RsSerializable
 {
 	RsGxsImage();
 	~RsGxsImage();
@@ -70,8 +70,16 @@ struct RsGxsImage
 	void clear(); 				// Frees.
 	void shallowClear(); 			// Clears Pointer.
 
-	uint8_t *mData;
 	uint32_t mSize;
+	uint8_t* mData;
+
+	/// @see RsSerializable
+	virtual void serial_process( RsGenericSerializer::SerializeJob j,
+	                             RsGenericSerializer::SerializeContext& ctx )
+	{
+		RsTypeSerializer::TlvMemBlock_proxy b(mData, mSize);
+		RsTypeSerializer::serial_process(j, ctx, b, "mData");
+	}
 };
 
 
diff --git a/libretroshare/src/serialiser/rstypeserializer.cc b/libretroshare/src/serialiser/rstypeserializer.cc
index 9c2ebc37b..9a21eef0f 100644
--- a/libretroshare/src/serialiser/rstypeserializer.cc
+++ b/libretroshare/src/serialiser/rstypeserializer.cc
@@ -25,7 +25,7 @@
 #include "serialiser/rsbaseserial.h"
 #include "serialiser/rstlvkeys.h"
 #include "serialiser/rsserializable.h"
-
+#include "util/radix64.h"
 #include "util/rsprint.h"
 
 #include <iomanip>
@@ -646,9 +646,12 @@ bool RsTypeSerializer::to_JSON(
 	rapidjson::Value key;
 	key.SetString(memberName.c_str(), memberName.length(), allocator);
 
+	std::string encodedValue;
+	Radix64::encode( reinterpret_cast<uint8_t*>(member.first),
+	                 member.second, encodedValue );
+
 	rapidjson::Value value;
-	const char* tName = typeid(member).name();
-	value.SetString(tName, allocator);
+	value.SetString(encodedValue.data(), allocator);
 
 	jDoc.AddMember(key, value, allocator);
 
@@ -656,7 +659,27 @@ bool RsTypeSerializer::to_JSON(
 }
 
 template<> /*static*/
-bool RsTypeSerializer::from_JSON( const std::string& /*memberName*/,
-                                  RsTypeSerializer::TlvMemBlock_proxy&,
-                                  RsJson& /*jDoc*/)
-{ return true; }
+bool RsTypeSerializer::from_JSON( const std::string& memberName,
+                                  RsTypeSerializer::TlvMemBlock_proxy& member,
+                                  RsJson& jDoc)
+{
+	SAFE_GET_JSON_V();
+	ret = ret && v.IsString();
+	if(ret)
+	{
+		std::string encodedValue = v.GetString();
+		std::vector<uint8_t> decodedValue = Radix64::decode(encodedValue);
+		member.second = decodedValue.size();
+
+		if(member.second == 0)
+		{
+			member.first = nullptr;
+			return ret;
+		}
+
+		member.first = rs_malloc(member.second);
+		ret = ret && member.first &&
+		        memcpy(member.first, decodedValue.data(), member.second);
+	}
+	return ret;
+}