fix: Add meaningful alert error message if file upload fails (#3093)

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/dashboard/components/widgets/conversation/ReplyBox.vue

@@ -347,7 +347,10 @@ export default {
           await this.$store.dispatch('sendMessage', messagePayload);
           this.$emit('scrollToMessage');
         } catch (error) {
-          // Error
+          const errorMessage =
+            error?.response?.data?.error ||
+            this.$t('CONVERSATION.MESSAGE_ERROR');
+          this.showAlert(errorMessage);
         }
         this.hideEmojiPicker();
       }