local link = "https://www.roblox.com/Thumbs/Asset.ashx?width=420&height=420&assetId=";
local assetId = 62234425;
local finalLink = link .. assetId; print(string.sub(finalLink, #link + 1))
print(finalLink) -- Will print 62234425, or you can use:
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local link = "https://www.roblox.com/Thumbs/Asset.ashx?width=420&height=420&assetId=";
local assetId = playerSelectedId; -- if the player chose the item id
if not tonumber(assetId) or not assetId or assetId < 1000 then assetId = default end;
local finalLink = link .. assetId; print(string.sub(finalLink, #link + 1))
print(finalLink) -- Will print the default