diff --git a/.github/workflows/root-ci-config/build_root.py b/.github/workflows/root-ci-config/build_root.py
index 7ae789e70baf6..9a8f4ace24d51 100755
--- a/.github/workflows/root-ci-config/build_root.py
+++ b/.github/workflows/root-ci-config/build_root.py
@@ -42,6 +42,14 @@
 WORKDIR = (os.environ['HOME'] + '/ROOT-CI') if not WINDOWS else 'C:/ROOT-CI'
 COMPRESSIONLEVEL = 1 if WINDOWS else 2
 
+def sizeof_fmt(num, suffix="B"):
+    for unit in ("", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi"):
+        if abs(num) < 1024.0:
+            return f"{num:3.1f} {unit}{suffix}"
+        num /= 1024.0
+    return f"{num:.1f} Yi{suffix}"
+
+
 def main():
     # openstack.enable_logging(debug=True)
 
@@ -437,6 +445,9 @@ def archive_and_upload(archive_name, prefix):
         targz.add("src")
         targz.add("build")
 
+    archive_size = os.path.getsize(f"{WORKDIR}/{new_archive}")
+    print(f"Archive {new_archive} size: {archive_size} bytes ({sizeof_fmt(archive_size)})")
+
     try:
         import openstack
         CONNECTION = openstack.connect(cloud='envvars')
diff --git a/.github/workflows/root-ci-config/build_utils.py b/.github/workflows/root-ci-config/build_utils.py
index 5ace08990c732..8983478f63bf2 100755
--- a/.github/workflows/root-ci-config/build_utils.py
+++ b/.github/workflows/root-ci-config/build_utils.py
@@ -265,20 +265,31 @@ def upload_file(connection, container: str, dest_object: str, src_file: str) ->
     if not os.path.exists(src_file):
         raise Exception(f"No such file: {src_file}")
 
+    gigabyte = 1024**3
+    week_in_seconds = 60*60*24*7
+    segment_size = 5 * gigabyte
+
+    file_size = os.path.getsize(src_file)
+    num_segments = max(1, (file_size + segment_size - 1) // segment_size)
+    print_info(
+        f"Upload config for {dest_object}: "
+        f"file_size={file_size} bytes, "
+        f"segment_size={segment_size} bytes, "
+        f"expected_segments={num_segments}, "
+        f"delete_after={2*week_in_seconds}s"
+    )
+
     def create_object_local():
         connection.create_object(
             container=container,
             name=dest_object,
             filename=src_file,
-            segment_size=5*gigabyte,
+            segment_size=segment_size,
             **{
                 'X-Delete-After': str(2*week_in_seconds)
             }
         )
 
-    gigabyte = 1024**3
-    week_in_seconds = 60*60*24*7
-
     max_attempts = 5
     sleep_time_unit = 4
     success = False
@@ -291,6 +302,7 @@ def create_object_local():
             sleep_time = sleep_time_unit * attempt
             print_warning(
                 f"""Attempt {attempt} to upload {src_file} to {dest_object} failed. Retrying in {sleep_time} seconds..."""
+                f" (file_size={file_size} bytes, expected_segments={num_segments})"
             )
             time.sleep(sleep_time)
         if success:
diff --git a/.github/workflows/root-ci.yml b/.github/workflows/root-ci.yml
index 10ba68e8e88ff..19d961ba55270 100644
--- a/.github/workflows/root-ci.yml
+++ b/.github/workflows/root-ci.yml
@@ -90,7 +90,7 @@ jobs:
     # can be skipped if the tag [skip-ci] or [skip ci] is written in the title.
     if: |
         (github.repository_owner == 'root-project' && github.event_name != 'pull_request') ||
-        (github.event_name == 'pull_request' && !(
+        (github.event_name == 'pull_request' && false && !(
           contains(github.event.pull_request.title, '[skip-ci]') ||
           contains(github.event.pull_request.title, '[skip ci]') ||
           contains(github.event.pull_request.labels.*.name, 'skip ci')
@@ -248,7 +248,7 @@ jobs:
     # can be skipped if the tag [skip-ci] or [skip ci] is written in the title.
     if: |
         (github.repository_owner == 'root-project' && github.event_name != 'pull_request') ||
-        (github.event_name == 'pull_request' && !(
+        (github.event_name == 'pull_request' && false && !(
           contains(github.event.pull_request.title, '[skip-ci]') ||
           contains(github.event.pull_request.title, '[skip ci]') ||
           contains(github.event.pull_request.labels.*.name, 'skip ci')
@@ -527,7 +527,7 @@ jobs:
           build-directory: /github/home/ROOT-CI/src/
 
       - name: Pull Request Build
-        if:   ${{ github.event_name == 'pull_request' }}
+        if:   ${{ github.event_name == 'pull_request' && false }} # TEMP DEBUG
         env:
           INCREMENTAL: ${{ !contains(github.event.pull_request.labels.*.name, 'clean build') }}
           GITHUB_PR_ORIGIN: ${{ github.event.pull_request.head.repo.clone_url }}
@@ -561,14 +561,14 @@ jobs:
               "
 
       - name: Nightly build
-        if:   github.event_name == 'schedule'
+        if:   github.event_name == 'schedule' || github.event_name == 'pull_request' # TEMP DEBUG
         run: ".github/workflows/root-ci-config/build_root.py
                     --buildtype      RelWithDebInfo
                     --platform       ${{ matrix.image }}
                     --platform_config ${{ matrix.platform_config }}
                     --incremental    false
                     --binaries       true
-                    --base_ref       ${{ inputs.ref_name }}
+                    --base_ref       ${{ inputs.ref_name || github.base_ref }}
                     --repository     ${{ github.server_url }}/${{ github.repository }}
               "