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If both computers are attached to the same wireless hotspot, then they should be able to contact one another directly via IP address. This is the same as on a normal internet connected LAN -- hence you can also use the same kind of software to transport the files. Using SMB/CIFS is popular with Windows users, implemented by Samba on the linux side. To that end you will find many questions tagged samba here and an order of magnitude more on our big sibling site Unix & Linux. Note that Raspbian is essentially a normal GNU/Linux OS distro with some cosmetic and configuration tweaks.

You are not bound to use SMB/CIFS, of course. I believe there is some Windows side software around to mount SSHFS shares, which is more popular with linux users. You can also use normal FTP, a web server, etc. etc.

WRT Android there look to be both Samba and SSHFS clients available.

If both computers are attached to the same wireless hotspot, then they should be able to contact one another directly via IP address. This is the same as on a normal internet connected LAN -- hence you can also use the same kind of software to transport the files. Using SMB/CIFS is popular with Windows users, implemented by Samba on the linux side. To that end you will find many questions tagged samba here and an order of magnitude more on our big sibling site Unix & Linux. Note that Raspbian is essentially a normal GNU/Linux OS distro with some cosmetic and configuration tweaks.

You are not bound to use SMB/CIFS, of course. I believe there is some Windows side software around to mount SSHFS shares, which is more popular with linux users. You can also use normal FTP, a web server, etc. etc.

WRT Android there look to be both Samba and SSHFS clients available.

If both computers are attached to the same wireless hotspot, then they should be able to contact one another directly via IP address. This is the same as on a normal internet connected LAN -- hence you can also use the same kind of software to transport the files. Using SMB/CIFS is popular with Windows users, implemented by Samba on the linux side. To that end you will find many questions tagged samba here and an order of magnitude more on our big sibling site Unix & Linux. Note that Raspbian is essentially a normal GNU/Linux OS distro with some cosmetic and configuration tweaks.

You are not bound to use SMB/CIFS, of course. I believe there is some Windows side software around to mount sshfs shares, which is more popular with linux users. You can also use normal FTP, a web server, etc. etc.

WRT Android there look to be both Samba and SSHFS clients available.

If both computers are attached to the same wireless hotspot, then they should be able to contact one another directly via IP address. This is the same as on a normal internet connected LAN -- hence you can also use the same kind of software to transport the files. Using SMB/CIFS is popular with Windows users, implemented by Samba on the linux side. To that end you will find many questions tagged samba here and an order of magnitude more on our big sibling site Unix & Linux. Note that Raspbian is essentially a normal GNU/Linux OS distro with some cosmetic and configuration tweaks.

You are not bound to use SMB/CIFS, of course. I believe there is some Windows side software around to mount SSHFS shares, which is more popular with linux users. You can also use normal FTP, a web server, etc. etc.

WRT Android there look to be both Samba and SSHFS clients available.

If both computers are attached to the same wireless hotspot, then they should be able to contact one another directly via IP address. This is the same as on a normal internet connected LAN -- hence you can also use the same kind of software to transport the files. Using SMB/CIFS is popular with Windows users, implemented by Samba on the linux side. To that end you will find many questions tagged samba here and an order of magnitude more on our big sibling site Unix & Linux. Note that Raspbian is essentially a normal GNU/Linux OS distro with some cosmetic and configuration tweaks.

You are not bound to use SMB/CIFS, of course. I believe there is some Windows side software around to mount sshfs share, which is more popular with linux users. You can also use normal FTP, a web server, etc. etc.

If both computers are attached to the same wireless hotspot, then they should be able to contact one another directly via IP address. This is the same as on a normal internet connected LAN -- hence you can also use the same kind of software to transport the files. Using SMB/CIFS is popular with Windows users, implemented by Samba on the linux side. To that end you will find many questions tagged samba here and an order of magnitude more on our big sibling site Unix & Linux. Note that Raspbian is essentially a normal GNU/Linux OS distro with some cosmetic and configuration tweaks.

You are not bound to use SMB/CIFS, of course. I believe there is some Windows side software around to mount sshfs shares, which is more popular with linux users. You can also use normal FTP, a web server, etc. etc.

WRT Android there look to be both Samba and SSHFS clients available.