diff --git a/continuousprint/plugin.py b/continuousprint/plugin.py
index a4a3fb40..3f2d9990 100644
--- a/continuousprint/plugin.py
+++ b/continuousprint/plugin.py
@@ -8,6 +8,7 @@
 import traceback
 import random
 from pathlib import Path
+from octoprint import __version__ as octoprint_version
 from octoprint.events import Events
 from octoprint.filemanager import NoSuchStorage
 from octoprint.filemanager.analysis import AnalysisQueue, QueueEntry
@@ -113,6 +114,10 @@ def _get_key(self, k, default=None):
         v = self._settings.get([k.setting])
         return v if v is not None else default
 
+    def _octoprint_version_exceeds(self, major: int, minor: int):
+        cur_major, cur_minor = [int(c) for c in octoprint_version.split(".")[:2]]
+        return cur_major > major or (cur_major == major and cur_minor > minor)
+
     def _add_folder(self, path):
         return self._file_manager.add_folder(
             FileDestinations.LOCAL, self._path_in_storage(path)
@@ -667,9 +672,24 @@ def on_event(self, event, payload):
                 self._logger.debug(f"Enqueued newly added file {payload['path']}")
             return
 
-        if (
-            event == Events.UPLOAD
-        ):  # https://docs.octoprint.org/en/master/events/index.html#file-handling
+        # Events.UPLOAD only applies to REST file upload calls.
+        # This ignores other file addition events from plugins
+        # and the file watcher.
+        # https://github.com/OctoPrint/OctoPrint/pull/4687 adds the
+        # `operation`attribute to Events.FILE_ADDED and eliminates the
+        # need for Events.UPLOAD to discriminate adding/copying/moving files.
+        file_uploaded = False
+        version_after_1_8 = self._octoprint_version_exceeds(1, 8)
+        if not version_after_1_8 and event == Events.UPLOAD:
+            file_uploaded = True
+        elif (
+            version_after_1_8
+            and event == Events.FILE_ADDED
+            and payload["operation"] == "add"
+        ):
+            file_uploaded = True
+
+        if file_uploaded:
             upload_action = self._get_key(Keys.UPLOAD_ACTION, "do_nothing")
             if upload_action != "do_nothing":
                 if payload["path"].endswith(".gcode"):
diff --git a/continuousprint/plugin_test.py b/continuousprint/plugin_test.py
index 5db89cb6..d7f2c85f 100644
--- a/continuousprint/plugin_test.py
+++ b/continuousprint/plugin_test.py
@@ -250,6 +250,7 @@ def setUp(self):
         self.p.q = MagicMock()
         self.p._sync_state = MagicMock()
         self.p._plugin_manager.plugins.get.return_value = None
+        self.p._octoprint_version_exceeds = lambda a, b: False
         self.p._setup_thirdparty_plugin_integration()
 
     def testTick(self):
@@ -427,6 +428,16 @@ def testFileAddedWithNoAnalysis(self):
         self.p.on_event(Events.FILE_ADDED, dict(path="a.gcode"))
         self.p._analysis_queue.enqueue.assert_called()
 
+    def testFileAddedWithOperationPrintable(self):
+        self.p._octoprint_version_exceeds = lambda a, b: True
+        self.p._set_key(Keys.UPLOAD_ACTION, "add_printable")
+        self.p._add_set = MagicMock()
+        self.p.on_event(
+            Events.FILE_ADDED,
+            dict(path="testpath.gcode", storage="local", operation="add"),
+        )
+        self.p._add_set.assert_called_with(draft=False, sd=False, path="testpath.gcode")
+
 
 class TestGetters(unittest.TestCase):
     def setUp(self):