Skip files that are too large.

main.py

 import requests
 from mastodon import Mastodon
 
+MAX_SIZE = 39000000
+
 def load_config():
     with open(os.getenv('MR_CONFIG', 'config.json'), 'r') as f:
         return json.loads(f.read())
             image_resps = []
             for a in data['media']:
                 dlpath = download_file(a, td)
+                fsize = os.path.getsize(dlpath)
+                if fsize > MAX_SIZE:
+                    print('ignoring file (too big):', dlpath, fsize, 'bytes')
+                    continue
                 res = masto.media_post(dlpath)
                 image_resps.append(res)