A transaction hash (also called a transaction ID) is a unique set of characters assigned to every blockchain transaction.
Ethereum block explorer etherscan.io , Binance Smart Chain block explorer bscscan.com .
The transaction hash is best sent by copying/pasting from your wallet or a block explorer. Sending screenshots of transactions can distort and pixelate the transaction ID characters. Sending screenshots may delay a support agent's resolution to your issue.
It's recommended to double check that you've copied the hash correctly.