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POL (native) = It is treated as an internal ("self") transaction; this is a precautionary measure to avoid surprises and protect the network. Since there is a risk that an internal transaction could be erroneous or fraudulent, it is blocked by default. If you have the seed phrase (as you do on Gleec), you can view the transaction and send it back normally.
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USDT POL (ERC-20) = No problem, the transfer goes through directly. The ERC-20 standard includes an explicit "Transfer" event; exchanges (like Binance, Fiatleak, FaucetPay, etc.) detect it instantly without needing to search for anything.
In summary:
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POL = must first pass through your own wallet ("self"), then you can send it normally.
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USDT POL = you can send it directly to the destination of your choice; the transfer goes through immediately.
You now have a better understanding of the system than many others!
So you have the solution: if you want to transfer POL, go through your wallet ("self") and then send it. If you want to avoid complications, send USDT POL directly.

Posted Using INLEO