The best alternatives to Space Drop are Shopify, Sense, and FilePane. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hurree— The smarter, simpler way to analyze your data
Yoink for iPad and iPhone lets you easily and quickly store items you drag, copy, share or download for later use. This way, you can collect items in a central place without having to constantly move back and forth between your source- and destination applications.