diff --git a/build.py b/build.py
index d70b70d..6cd9009 100644
--- a/build.py
+++ b/build.py
@@ -157,13 +157,34 @@ def build(build: bool = True, copy: bool = True, test: bool = False, dest: str |
         if not artifact_dir.exists():
             artifact_dir = project_root / "dist"
 
-        # Look for a matching artifact
-        candidates = list(artifact_dir.glob("Uploader*")) + list(artifact_dir.glob("*.exe"))
-        if not candidates:
-            print(f"No build artifact found in {artifact_dir}, skipping copy")
+        # Look for a matching artifact. Prefer exe files named Uploader*.exe,
+        # then any .exe, then directories named Uploader* (onedir builds).
+        # Exclude obvious non-artifacts like log files.
+        candidates = []
+        # Uploader*.exe (preferred)
+        candidates.extend(sorted(artifact_dir.glob("Uploader*.exe")))
+        # any .exe
+        candidates.extend(sorted(artifact_dir.glob("*.exe")))
+        # onedir: directories starting with Uploader
+        candidates.extend([p for p in sorted(artifact_dir.glob("Uploader*")) if p.is_dir()])
+
+        # Filter out files that look like logs or non-executables
+        def is_valid_artifact(p: Path) -> bool:
+            if not p.exists():
+                return False
+            if p.is_file():
+                # require .exe for files (Windows builds)
+                return p.suffix.lower() == ".exe"
+            if p.is_dir():
+                return True
+            return False
+
+        valid = [p for p in candidates if is_valid_artifact(p)]
+        if not valid:
+            print(f"No build artifact (.exe or Uploader directory) found in {artifact_dir}, skipping copy")
             return
 
-        artifact = candidates[0]
+        artifact = valid[0]
 
         dest_path = Path(dest) if dest else default_dest
         dest_path.mkdir(parents=True, exist_ok=True)