diff --git a/mirai-core-mock/src/internal/contact/MockAnnouncementsImpl.kt b/mirai-core-mock/src/internal/contact/MockAnnouncementsImpl.kt
index e9bf35074..d4c9f2cf2 100644
--- a/mirai-core-mock/src/internal/contact/MockAnnouncementsImpl.kt
+++ b/mirai-core-mock/src/internal/contact/MockAnnouncementsImpl.kt
@@ -22,9 +22,10 @@ import net.mamoe.mirai.mock.contact.announcement.MockAnnouncements
 import net.mamoe.mirai.mock.contact.announcement.MockOnlineAnnouncement
 import net.mamoe.mirai.mock.contact.announcement.copy
 import net.mamoe.mirai.mock.utils.broadcastBlocking
+import net.mamoe.mirai.mock.utils.mock
 import net.mamoe.mirai.utils.ExternalResource
 import net.mamoe.mirai.utils.currentTimeSeconds
-import net.mamoe.mirai.utils.generateImageId
+import net.mamoe.mirai.utils.withAutoClose
 import java.util.*
 import java.util.concurrent.ConcurrentHashMap
 import java.util.stream.Stream
@@ -89,8 +90,8 @@ internal class MockAnnouncementsImpl(
         return mockPublish(announcement, this.group.botAsMember, true)
     }
 
-    override suspend fun uploadImage(resource: ExternalResource): AnnouncementImage = resource.inResource {
-        AnnouncementImage.create(generateImageId(resource.md5), 500, 500)
+    override suspend fun uploadImage(resource: ExternalResource): AnnouncementImage = resource.withAutoClose {
+        AnnouncementImage.create(group.bot.mock().uploadMockImage(resource).imageId, 500, 500)
     }
 
     override suspend fun members(fid: String, confirmed: Boolean): List<NormalMember> {