I use Trello at the company where I work. Over a period of 3 months, I attached around 200 documents to a card, but I noticed that some errors have occurred. Some documents did not appear on the card. Additionally, the mentioned card is quite slow. Is this normal? Is there a limit to the number of documents I can attach to a particular card? What is the best way to store images in .pdf, .tiff, .png, and .jpeg formats?