Add debug prints to track job submission and processing start

- Print when POST request is received
- Print when process_pdfs_async is called
- Help diagnose if threads are starting on remote server

app.py

@@ -354,6 +354,7 @@ def save_jobs(jobs):
 def index():
     global processing_complete, current_output_dir
     if request.method == 'POST':
+        print(f"POST request received at {datetime.now()}")
         files = request.files.getlist('files')
         if not files or files[0].filename == '':
             flash('No files uploaded')
@@ -687,6 +688,7 @@ def process_pdfs(pdfdir, outputfolder, job_id=None):
     current_output_dir = outputfolder
 
 def process_pdfs_async(pdfdir, outputfolder, job_id):
+    print(f"process_pdfs_async called with job_id={job_id}, pdfdir={pdfdir}, outputfolder={outputfolder}")
     global processing_complete
     print(f"Processing started for job {job_id} at {datetime.now()}")
     try: